I know, I know, you're all just trying to be helpful I'm sure, but: •I know what f.lux is and I use it. I'm not sure that simply reducing the output from the blue subpixels is necessarily eliminating all of the melatonin-suppressing wavelengths produced by the backlight. I also realize that sounds like homeopathic paranoia, but sleep cycles aren't my only issue anymore. See the following bullet point. •Eyestrain is my primary concern for during the day, and I don't use f.lux during those hours. Plus I can't for doing color-sensitive work, and if the clear glasses do help with eyestrain somehow, I will take my stupid human brain being convinced by a placebo over more eyestrain. •I intend to use the yellow-tinted glasses after sunset to ensure all sources of light are filtered. I don't live in the dark, ya know. •If I continue to experience issues with eyestrain I'll see an optometrist but I know for sure it's working in front of a backlit screen that causes that. A day away from the computer is always strain-free. This is all just me seeing what works. I'll continue to report as my journey continues.
Take more breaks and see the optometrist about getting some prescription glasses with specific lenses to block the specific bands of light and at the depth suitable for you and not some random glasses from the internet
Those remind me a lot of my prescription glasses, which (in addition to making the world not be blurry) are supposed to block UV light and some shorter wavelengths of blue light. I experience the same slight "yellowing" when looking at a white computer screen with them, but the main point of mine is to block UV light.
2 things, have you considered that your eyestrain could be caused not by the light, but your eyes focusing close up for hours on end? Secondly during the day you should consider trying neutral density sunglasses that reduce all light evenly if you can't reduce your display brightness. Your eyes should adjust to it and still allow you to do color sensitive work.
I saw and optometrist and got glasses that do help. I stare at screens 10hrs a day... They reduce glare and move the focal point further away. It's the staring at something close that causes strain. Humans are not meant to look at things two feet away from them all day and it literally strains the muscles in your eyes to keep your cornea flexed into a shape that allows you to focus there.
Super late comment but here goes: I got the same kind of glasses with provided test card and light. My standard reading glasses also blocked the "blue light" from the light. I tried the light on my glasses with transitions lenses and it immediately made them darken. Since transitions work with UV light, I think it confirms that the light they provide is actually UV. Finally I used my UV LED nail lamp on the test card and it instantly turned blue. I think it's safe to say it's all just UV.
The clear-y lenses have a UV filter in them, full stop. It's pretty normal for good glasses, and it's there to protect eyes from UV. Nothing about normal blue 😂
"Here's something to detect blue light!" Thanks, could already do that. I have two highly advanced organic blue light sensors built in, and most cameras try to mimic them.
Those can malfunction, and I can tell you that they are not calibrated. Just use the tools that I included, they are working, and have been calibrated to give perfect results. If anymore questions, feel free to contact customer support, they are available anytime. Thank you for buying our products, and have a good day.
Do I need to whoosh all of you? Fine, you get a whoosh, you get a whoosh, you get a whoosh, everybody in the audience today gets a whoosh. These whooshes are provided by satire. With satire, you can make a joke that goes over people’s head.
Those are UV-blocking glasses mislabeled as blue-blocking. The test torch contains a UV LED. Those tend to be about 395-405nm. They appear dim purple because this is a very near UV, not yet invisible. Things look blue under such light because of fluorescence.
shepardpolska UV C LEDs yes. But that torch is a Blue / near UV A one. They don’t provide a free UV torch with an LED that cost something like $20-30 which is probably just by itself more expensive than the two pair of glasses he bought.
@@godzil42 They do it with all UV LEDs since you can't see any kind of UV with your eyes. At best it would be like the IR diodes in remotes with UVA. But it might be a far blue 410nm LED. Those don't output any UV(atleast not enough to have any effect on anything) but have similar effects to UVA
@@shepardpolska that's completely wrong. Near-UV LEDs (e.g. for money bill testing) emit around 400nm, which is perfectly visible and appears as dim purple (commonly called blacklight). This wavelength can trigger many fluorescence reactions, and "whitening" dyes (in bleached paper or clothes) fluoresce in bright blue so the stuff appears shiny white under normal sunlight. Specific dyes can fluoresce in any color under 400nm blacklight, but this "UV" light is still visible, even if just barely. It makes no technical or economic sense to combine a 405nm "UV" diode with a 430nm or so "blue" one. It would double the price for no reason.
That would be true if it were a florescent bulb, but that is (most likely) an LED bulb which does not have any phosphor, it is just white plastic to diffuse the light from the LED.
Lots of random stuff fluoresces under long wave uv. Most white objects in my house fluoresces the same hue of the bulb under the led. (Yes i do randomly shine uv lights on thing) Most reflective surface (notably lamp Shades) seem to reflect the uv light back as seen with the led and the lamp shade. I have also seen a rock that held similar properties to that test card's color change. What he had bought are the first stylized uv blocking glasses i have seen.
I have one that came with glasses, and I figured out it was UV when it would immediately charge a glow in the dark nalgene bottle that I have. It's actually super cool, you can draw on glow in the dark stuff with it.
I thought it was. Only after several minutes did I realise my mistake. I thought it was a weird video for him so checked the name again and realised it's not his main account...
I watched this video a couple months ago, didn't think much of it. Recently found Technology Connections, watched a couple videos, and decided I'd sub to the channel. Just now realized they're the same person. Had no idea who Technology Connections was when I first watched this, and didn't remember this video when I subbed to him.
Shine the led on some money, they have UV markers in them. Also test the card thing using regular glass, that should block uv as well as these placebo glasses.
Window glass has a significantly more gradual UV cutoff than plastic prescription glass lenses with the usual UV-blocking treatment, like you get on all prescription glasses nowadays pretty much. These generally have a slightly yellowish tint that you can might or might not see depending on the frequency spectrum of the white that you're judging them against, because the cutoff is quite close to the edge of the visible spectrum just slightly encroaching on it, and the cutoff is very, very sharp. Which i bet this is what these clear ones are, just glasses with standard plano lenses from a prescription lens supplier. Which is to say, today's prescription lens tech can be quite impressive even from the super cheap suppliers.
Was going to suggest that, or using a postal stamp (at least in Canada they use UV sensitive ink in their stamps, don't know if the rest of the world uses UV sensitive ink in their stamps).
@@GRBtutorials I guess my "UV sensitive" transitions lenses are specifically UV B sensitive then. No matter how sunny, if I'm behind window glass, they don't get dark at all. Outside, very overcast, they still get about 75% dark.
Cheap "plastic" lenses are made of CR-39 resin, which conveniently blocks UV all by itself. It's arguably a better material for glasses then the slightly harder and more expensive polycarbonate they try to up-sell you on, as long as you don't need a huge refractive index.
You should have also checked the light provided on an ID, passport, or payment card. All of those have UV sensitive regions. Visa cards have a V printed over the Visa logo, MasterCards have M C on the front, AMEX cards will say AM EX on them, and Discover cards have DISCOVER on them. The ID page of a passport is also UV sensitive, as well as most drivers licenses (varies by state/province). Other IDs may too (NEXUS cards are kind of holographic).
The bulb looks blue while the reflection from the lamp body looks more purple because the bulb is coated in a material specifically meant to absorb UV, to prevent UV emission from the bulb itself. My guess is the LED is deliberately emitting both UV and blue wavelengths. Take that flashlight apart and let the sun shine through the lens portion, or just look through the lens in direct sunlight. I bet it will have a distinctly blue tint due to UV phosphorescence.
IIRC the bulb coating actually converts the UV into visible light. Without the coating it is a UV light like you used to see at night clubs. White LEDs use a coating for the same thing.
It's actually a UV fluorescent coating in the bulb to absorb the UV and re-emit in the visible range. If you use diffraction grating glasses you can see the coating emitting in a few discrete colors that combine to look like blue-white glow.
The moment you showed the test card I called it being a UV light; I've been an optician for 12 years and we had similar tools to activate Transitions lenses which *need* UV to work. I can say that proper blue-light blocking anti-glare does significantly reduce the amount of blue light that reaches your eyes; while this particular product is BS, the general concept of blue light blocking is legit.
while the concept of blue light is legit i feel like there are alot of fear mongering involved in the marketing making people feel like they cant live without them
@Jacob Faseler The abundance of blue light we exposed ourselves to is still a fairly new concept. One thing studies are still out on is whether over exposure can contribute to macular degeneration. So, while you may not see their usefulness unless you stare at a screen all day, you are not entirely correct that that's the only benefit. I for one have a family history of MD so every pair of glasses I have include blue light anti-glare. I'm curious to see if there's an uptick in cases over the next few decades.
I have Transitions lenses in my glasses. When a family member bought some blue-light-blocking eyewear for us, the first thing I thought to do was point the test light at my glasses. Also, because I have around -5 D polycarbonate lenses, the ever-annoying chromatic aberration lets me easily see that the yellow-tinted lenses do indeed block some blue light.
@@jlco You should consider doing hi-index lenses for your next pair. Much thinner, and poly has the worst chromatic aberrations of all popular lens materials anyway.
You sir need a prism/diffraction grating, it would be a way to tell what you are dealing with. The "clear" glasses could be notching out some common for lasers wavelength, but it is impossible to tell from a 3 channel(RGB) video.
@School's Out: Screw Around Actual diffraction grade made for that purpose are much better than a broken DVD. I have made spectrometers using DVD pieces, prisms and diffraction grates; the one made with the actual diffraction grate is much better. They are cheap, IIRC I paid about $10 on Amazon for a package of 25 of them. But yes in a pinch for a quick and dirty test, a piece of broken DVD works too.
If you have glasses with a strong enough prescription you can even look through the edge for a really rough approximation of all the wavelengths in something you’re seeing.
It is a UV LED with just one die. But they added fluorescent dye in the epoxy casing. This is common with UV LEDs so you can easily see that they are on.
Forssa1 But you can see the second die right in the video. It’s got two dies, one will be UV to expose the card and the other blue to trick the consumer.
@@tookitogo Actually quite a lot of UV LEDs shine blue we use a ton of them at work for detecting leaks and every single one of them has that really blue colour.
Himmel Then by definition they’re not UV, since ultraviolet light is invisible to the human eye. More likely, they’re near-UV, which many fluorescent items react to as well. I have UV LEDs, and their glow is a nearly invisible pale lavender color, from the small amount of visible light created (since an LED’s light is centered around a wavelength, but does produce tiny amounts of off-center light)
Himmel Or they’re deliberately using UV and blue LEDs in the lamps, to make them visible to the naked eye, so you won’t stare into them, or to make it easy to see if they’ve been left on by mistake, or something like that.
One way to test if an led has multiple diodes seems kinda silly, but it’ll work. Turn the led on and hold a magnifying glass in front of it. Put the led at the focal point of the glass and you can project a large image of the diode itself on the wall. The leds I’ve done this with were only one color, but a couple had multiple wafers making up the diode. They are easily distinguishable from each other. But as others have pointed out, the one here is a uv led. They’re mostly just purple/blue with a *very* small amount of uv mixed in. You was getting the purple and blue separated like that probably because of refraction from the casing of the led itself (the same type of refraction that causes rainbows)
For a while I wore amber tinted sunglasses because they helped with light sensitivity issues. If you find a good pair then it's a really weird experience, even a bright blue light looks grey and very dim, and blue objects are close to black, but after a little while wearing them you get used to them and most other colours look normal, until you take them off and suddenly colours are way brighter than usual. If I could do it without getting weird looks I'd wear something similar all the time.
those are laser goggles and not intended for computer use. the clear glasses are blocking the uv light that you want to stop. seriously guys if we didn't want blue light from our monitors we wouldn't put blue leds in there.
I've just accepted the weird looks at this point. Being able to just *shop* in a *grocery store* with *fluorescent lights* without feeling like I'm going to die is worth the tradeoff, for me.
@@estaworks-3d102 Of course we want blue light from our monitors during the day otherwise colours would look all weird, the thing is that the blue light can stress your eyes and be very uncomfortable when it's dark out as well as potentially impact sleep, at least for me that is. So light filtering glasses or programs that reduce or eliminate that blue light makes a world of difference in terms of comfort. My eyes hurt significantly less when using f.lux at a very low colour temperature.
I got a set of those a couple months ago for night driving, i work in grocery stores for abt 12 hours a day and can say it definitely helps with the eye fatigue i get from being under bright flourescent and LED's all day.
This reminds me of an infotisement for some "miracle car finish" from back in the day. To demonstrate its protective abilities, they pointed a blue laser at a red car, which burned the surface. Then, they applied their product to another car... a WHITE car... and hit it with the laser. Oooo, ahhh, no damage!
The card has a coating that absorbs UV and then emits visible light. The diode is certainly an UV diode. You can use some dollar bill and shine the LED o them to prove it is indeed UV.
It’s not a definitive “UV” test as they will fluoresce beginning with blue wavelength light (which has enough energy to begin activating many fluorescent colors) and by the time you get to violet your getting so close to the start of UV-A that the effect is very similar as it’s all a continuum. The LED is likely a 395-405nm violet to very near UV-A source (the transition between violet and near UV is 400nm). Polycarbonate has a very sharp cutoff at ~400nm which makes it very good for blocking anything from near UV-A through UV-C. A better test for UV versus violet is to use a known polycarbonate lens or plastic sheet and to shine the LED on a fluorescent source through the polycarbonate. If the polycarbonate blocks or very substantially attenuates the fluorescence versus without then you know you are dealing with an LED on the order of ~395-405nm violet to very near UV-A (anything with a shorter wavelength will no longer have an observable violet tint and anything much longer would appear blue to indigo).
Pingu McPing That isn’t what the OP said. His comments are in reference to the fact that the card is emitting light in the visible blue spectrum by “stealing” energy from the UV spectrum and then emitting that borrowed energy in the visible blue spectrum (fluorescence as opposed to phosphorescence).
Pingu McPing With respect you are confusing fluorescence (the re-emission of light at a lower or higher wavelength) with phosphorescence (sustained glowing in the absence of light, as in “glow in the dark”, due to previously stored energy). Fluorescence is not “glowing in the dark” and these cards (and their like for other wavelengths) fluoresce while exposed to light of suitable wavelength. If you would like to learn more about this phenomena then you may wish to visit the Applied Science channel where you will find a recent video covering this same effect in considerably more detail.
That is a "royal blue" LED. They are used as a pump LED for white phosphor LEDs. They are in the 395nm to 405nm range. They are right on the border of UV/Vis. Those glasses are nothing more than simple uv filters, like what are used on higher end cameras.
Those testing cards are almost identical to the ones we used to use when I worked in tech support to test whether or not infrared remotes were working or not.
I'm good at chemistry, but I don't really understand the science of flourecence. It has something to do with how the molecule of dye is shaped. Edit: Most white plastics contain phosphors, so they flourece under sunlight which makes them look very white. The UV in sunlight is not much, which is why white plastics dont glow brightly, but UV lights emit stronger UV, so they glow.
Oh good someone said this. Its phosphor pigments that glow close to natural night and that's what's in fluorescent light bulbs and some of the soft glowing LEDs I believe.
So not blue blocking glasses but uv blocking glasses, maybe you could sell these as a concept for protecting people’s eyes in bright sunlight, and maybe you could call them sunglasses. Forget that I doubt it would ever catch on.
I'm holding a 405nm laser right now and it behaves exactly like in the video. If i shine it on some objects its violet and others it turns brighter and bluer. Shining it on some plastics even makes it a bright white beam. My guess is that the violet laser is able to excite the UV fluorescent dyes that's in things.
@MyGodisYahweh $5 is not at all cheap for a piece of crap add on thing like that keychain. There is no way they would have bothered if it cost more than about 20 cents.
@@jak231 A 400nm laser diode looks absolutely nothing like what is seen in this video. ummm....Divergence? Speckle? Intensity? Hello? Stop. Get some help.
I used to work testing blue light emissions from LED sources. Generally we were looking for 455nm which is the colour used in most white LEDs used in general lighting and LED backlight sources. Just for kicks I did test both the dark yellow, blue light blocking safety specs we were required to wear and my prescription glasses with 'blue light' filtering coating. As you can imagine the safety specs did block pretty much all the blue light, my prescription glasses reduced it by 30%. Looking at the specs you have compared to mine I'd say they will do something... but not an awful lot.
Most banknotes have some sort of security features that are UV-reactive, you could try shining it on banknotes and see if the security markers light up
@@lucasmironne3578 It's purple, but it's kinda close to being a dark blue. ... Monitor type and quality may make colour results different (and also how much gamma is set).
For mine, it's honestly less about the monitor blue light and more about the surroundings. I work in an office, and the ubiquitous fluorescent lights get turned in to a slightly 'warmer' color temperature that makes things a lot more enjoyable. Plus, they're basically reading glasses. Welp, that was probably a useless anecdote.
I'm currently wearing a pair of Gunnars with their latest "Clear" lenses, which are around a 5% amber tint with their coatings. I'm appreciative that they make the neutral white of my display look comfortably warm without me needing to jump through the hoops of trying to color calibrate a setting to cut down on the blue without making the colors look horrible. I've had less problems with eye strain since purchasing Gunnars years ago, so I'm content to keep doing so. $300 for a pair of decent prescription glasses that don't leave my eyes feeling utterly exhausted after only a few hours of looking at a screen is a VERY cheap price to pay. I am envious of the people who don't need glasses to see properly in the first place, though.
Fun fact: glass (that very common glass that is) absorbs around 80% of UV, that's how your mirror blocks it so easily (it is both pretty thick, and then light has to pass it twice). The bluish luminescence can be due to either the crystal coating, or even the reflector material. Most likely a safety feature of the LED, as UV is barely visible so your eye doesn't react properly to one's intensity, which can damage it therefore.
I have a UV flashlight with 9 diodes. It's a lot of fun to mess with at night - I apparently have a bunch of things in my room that are UV reactive (no, not the stains on my bedsheets. Weellll, not *just* those anyway ;) ) like certain words on the spines of my books, some of my Lego pieces, which was super creepy at first as I mostly have Bionicle sets and only the eyes light up...
Optical engineer here. It's probably a 405 nm source, it there abouts. It's right in the edge of uv/blue so depending on how you look at the beam it will appear like that brilliant blue or be a little purple. Most of the cheap ones are fairly broadband and some even bleed down 20 nm into the UV. The card is seeing uv, maybe kinda sorta, some of those cards have broad detection bands and the boundary is soft. There are plenty of glass types out there that clip at or around 410 nm and are still largely clear if they're thin. I'm guessing we have a combo of just the right glass, card, and source. Do take away? They won't do squat. If your eyes are young wavelengths down to 380 nm may be visible but I'm real terms nothing below 400 nm is relevant or detectible enough to cause eyes strain. The blue light theory is a little goofy anyway. Sure, narrowing the band will always help with focus but it's not magic. Go to the doc and get tested. I got tired of dealing with my eyes strain and they found a little astig in each eye. All day working with the glasses and I no longer feel like I'm going be 8 at night.
Anyway - yeah, it's a scam. What a wildly stupid scam too - there's no way that little torch costs them less than just putting a proper amber tint on the glasses.
I totally agree. I thought that same thing too. Except imagine how many more of these that they sell because they don't have the stupid yellow orange color but they 'still work just as well'. Stupid like a fox!
7:01 Lower the battery voltage - probably replace one of the coin cells with a carefully crafted wad of foil. Best results from using a voltage supply you can dial up the voltage until you find the diod(es) forward voltage. They start as faint glowing specs that are easy to resolve
I suspect you've probably looked into it already since you mentioned eyestrain as a complaint. But have you had your sight measured by an optometrist recently? A few years ago I started noticing that I'd get headaches halfway during the work day, initially I blamed it on the building air processing system (which was a bit bad on that wing). But then I noticed that while working in the same wing while having a few more meetings and other away from staring at a monitor 99% of the time work I didn't have it there. So turned out that when I had my eyes measured that I needed a different correction factor for long distance and monitor reading distance. It was a small difference: long distance -4.00 (L) -4.75 (R) monitor distance: -3.25 (L) -4.00 (R) This might not seem like much, but it pretty much made the eyestrain and headaches go away. Getting into the habit of using a second pair of glasses was a bit annoying but now I've reluctantly accepted it as a thing I need to use when planning to spend more than 15-20 minutes at a monitor.
Eye drops can help. Never knew until after LASIK how much eyestrain could be from just dry eyes. I still buy those lubricating drops they gave me after the surgery because of that.
I had headaches at work that I thought were simply overstimulation turn out to be shoddy adapters, solved by simply swapping over to DVI and VGA cables (whoever hooked it up obviously didn't have the right cables and an overabundance of adapters because there were completely pointless adapters in the mix making the picture slightly out of focus and haloed)
UV light will make titanium dioxide based pigments fluoresce blue. It was clear when the bull pigment went blue but the lampshade was purple (and the blue of the test card).
More modern research states that blue light doesn’t have bad effects anyhow. The reason blue light keeps you awake is just because your using a screen, and taking in information. Doesn’t matter what color.
My wife uses the clear ones you have and, I too, am skeptical of whether they actually do anything. But I'm not going to tell her or show her your video because I think she looks pretty hott when she wears glasses. Placebo effect or not, they work for me. 🙃
"i'm gonna keep information that might be important to my wife's health from her because i like my boner more" yeaaaah so did she know what an asshole she married?
@@LeicaCat Sooo many TV sitcoms and romcoms where the plain librarian takes off her glasses, shakes out her hair and is transformed into a beautiful woman. Again, no woman looks good in glasses. Just like dudes in baseball caps all look like idiots.
You'll need a actual analyzer for that. Normal glass prisms don't pass uv spectrum very well and even if you get a quartz prism an optoelectronic to detect it since people don't see uv light. Anyway if he does have access to these equipments he is going to have more understanding of "blue light" thing and GaN LEDs and not making this video
@@seldompopup7442 But the test is just to see whether it is actually the blue light affecting the test card. As far as I'm aware, UV light and blue light don't pass through any commercial prisms at the same angle as each other, so it should still work for that test -- just shine the light through the prism, hold the card so that the refracted blue light is hitting the reactive area, and see what happens.
The reason it looks different on the light bulb to the lampshade is that the white 'diffuser' on many bulbs likely has compounds in it which shift the light from UV into the visible spectrum, this is useful so that any UV light created by the bulb itself isn't wasted. Also on the note of placebos be aware of the opposite effect that if you expect something to not work then it's much less likely to do so.
Headline: "Persnickety white man yells at glasses" Seriously though, I absolutely love your stuff. This is a great off the cuff channel. I subscribed because you led me to the perfect toaster on your main channel (found one at a second hand store), and your exploration of tech stuff just makes me smile.
I'm betting that's near UV ~405nm LED wavelength same as the diode in a blue ray or HD-DVD player. I took apart a HD-DVD add-on from an Xbox and made a laser pointer back in the day, had the same look. I would almost guarantee you're suspicious is correct based on my 2¢.
That makes even more sense. There must be some factory in China with piles and piles of unsold HD-DVD drive parts due to the failure of the format. Doesn't take a lot for someone to think about transforming the diodes into funky keychain torches with those super cheap cases.
Razor Koopa I bought the laser carriage as a spare part not the whole drive so I assume it was either a part or scavenged from a broken device. I did it mostly because I could and there was no other way to get a near us laser pointer at the time and tinkering is fun. Now a 405nm laser pointer is trivial to find on deal extreme amazon and the other regular places.
I have an underwater uv light for scuba diving. It definitely puts out enough visible light that you need an amber filter to be able to see the phosphorescence very well. I suspect this is the same type of led.
I'm very impressed and confused by the UV blocking glasses. I feel like between the cost of the UV lamp, the testing card, and the UV blocking lenses, they're chewing through all the cost and more of using an actual blue-blocking lens instead, no matter how much more expensive that lens might be than the UV blocking lens. That's a lot of engineering to go through to "prove" your scam product, which has to cost more than just making a not scam product.
It's not about the cost. It's meant for if you're not thinking too hard; "Wow these are great! They totally block out the blue light and I can still see blue stuff!" And then you recommend them to a friend and give a five star review. Somehow they must have calculated that the extra sales from being "better" than the competition would be more profitable than making a product that's actually equally good and therefore has to compete by price.
A lot of plastics block uv, surprisingly. And they basically got someone to produce a blue led flashlight without the proper uv filters. They are probably making a decent profit per unit.
The product is eye protection against harmful blue light, and UV is harmful light which can debatably be considered blue (380-400 nm is somewhat visible, but UV). The labeling is misleading, but I'm not even sure if the amber glasses in this video actually provide benefits over the clear ones (and amber lenses make it harder to see blue things).
The problem with blue-blocking lenses is, they make everything yellow. This is unavoidable but annoying. But this company claims to sell super-clear blue-blocking lenses"that *don't* make everything yellow. It's a "superior" product, so they charge more for them -- twice as much! -- and include the LED light and card to "prove" that they work.
The real question is why did you buy "blue blocking" glasses that are not yellow? It's quite obvious it's a scam, images don't get to keep their hue if you completely remove a part of the visible spectrum in it. Unless it blocks a very narrow part of the spectrum in the blue wavelengths, but what good would those glasses do?
It's a UVA\B "curing" light for gel nail polish. The card is UV reactive for testing if the UV light source is strong enough to "cure" the polish. Also, purple isn't a color of light. After blue comes a light blue\indigo color before you can't detect light frequency with your eyes.
There is one more color of light before it becomes undetectable by human eyes, and that color is violet. After violet comes Ultraviolet. The true rainbow is a spectrum, but to match the number of notes in a musical scale, 7 colors were named. Red Orange Yellow Green Blue Indigo Violet. The 7 colors of the visible light spectrum. Indigo is also less intense in terms of brightness than blue, so I don't understand how indigo can be anything remotely equivalent to a light blue.
I do, but I'm willing to believe that some of the blue from the backlight does get bast the red and green filters. I'm also willing to believe that's entire bull excrement, but part of what I want to reduce is eyestrain during the day and when I'm editing my videos. Sure, I could do all the color stuff with f.lux disabled but I gotta tell you it gets really annoying looking at everything with that intense coloration. I intend to wear the yellow glasses after sundown also just to reduce stimulation from the lights around me that aren't screens. There are plenty of those, too.
F.lux and make it so your screen shows zero blue light. If he still has problems at that point, it makes me wonder if he wears contact lenses. I used to have problems with eye strain when wearing contacts while on the computer, and by wearing face-fitting glasses to reduce moisture loss as well as blocking blue light mostly solved it. The best thing is to just not wear contact lenses while on a screen since the lenses will dry out quicker than your eye, and the lenses while shift easily, causing further irritation.
This is a card used to check for UV leakage in Lasers, I've seen it being tested before. Completely useless for checking blue light as far as I know. I assume it does lower eye strain cause it blocks UV light, there is always some UV leakage from every light source (the white light of your camera made the test card a bit dark also), but it's not a huge amount, so I'd say mostly placebo.
@@Byter09 not like by accident, they just do block UV and the added hint of some coating kinda sorta maybe perhaps somewhat blocks a little of something... Or they might even be a special protective UV glasses for tanning salons.... Who knows what chinese were making them for when they got aproached by some clever turd who ordered batch to be made with his logo and sells them for 10x profit
It will almost certainly be a violet to near UV LED between 395-405nm (the cutoff for near UV begins at 400nm). Anything shorter wavelength than that in a UV LED will have no discernible violet in its output. For example, a 365nm UV-A LED will not appear at all violet to the human eye (at least not an eye with a natural cornea - YMMV with implant corneas, such as post cataract surgery). Basically this LED sits in the cusp between visible violet and just barely touches the very near UV realm. A definitive test would be to introduce a polycarbonate lens or sheet between the LED and the UV sensitive test card (or fluorescent colors) as the polycarbonate has a very sharp cutoff at ~400nm and will pass no UV whatsoever (well, a fraction of a fraction of a percent will pass, but that’s pretty darn close the being “UV opaque”).
Worried about his health, and eyestrain. Buys Blue-light blockers. Looks into suspected UV source for 10+ minutes, providing commentary for us viewers looking at only visible spectrum footage. Quality entertainment. Beautiful public service. We love you, 11/10, please don't ever do again.
Eyestrain is usually caused by tiredness in the ciliary muscles which control your lenses. This can be triggered by not having to focus your eyes for a while or holding something too close to your eyes. Blocking blue light does jack shit to prevent eyestrain. Any perceived benefit to blue light blocking is just placebo.
This is flat out just a hunch, but I think the reason you're only getting blue light back at 8:42 is because the mirror coating is on the back side of the glass, and glass almost completely blocks UV B and C light. Thus I'd imagine your purple reflection is off the front face of the glass, and the blue reflection is off the mirror surface EDIT: I stepped away for a moment and began to wonder why your phone's camera would be able to pick up on the UV reflection if it wasn't passing through the mirror's glass. Then it struck me that most modern phone cameras are actually sapphire glass, and sapphire offers much wider ranges of UV B and C transmission
@@Surestick88 , he noted the card reacted in the sunlight. Therefore, he can test the effectiveness to block the UV light by putting the card behind the amber lenses. If the reacts, and considering it didn't -or very little- when exposed to the blue light from the screen as well as the white light from the phone, they do not block UV rays.
@@jizzlecizzle1388 The card strongly reacting to sunlight but not significantly reacting the phone's flashlight is already pretty convincing evidence that it is UV-reactive material in the card.
Just about any pair of glasses you'll find will block UV so I'm guessing you're going to have a lot of trouble finding a pair of glasses that won't help with that UV reactive card.
There is a single LED, and it is a near UV. The glasses are NOT blue blocking. The true blue blocking, amber color glassed make the LED a bit dimmer due to removing the blue portion of the near UV light. These glasses MIGHT provide some protection when working with UV lights however, I would not use them for that purpose in place of properly designed and tested safety glasses.
The water tester is legit, but it just measures how well the water transmits an electric charge. Aka the amount of dissolved salts or ions in the water, which does nothing for testing bacteria content or otherwise
Pretty much all UV LEDs look like what you showed. Might be fun to destructively take apart the little UV light and get a better look at the diode. Or get a spectrometer (of find a scientist buddy to collab with that has one) that can measure UV and test what wavelengths it actually spits out.
So in fact will every violet LED out there and even many cheaper blue LED's, LED's are more narrow band than light produced by incandescence but they are not monochromatic. The emission is typically on the order of 30 nm or so wide for a fairly good one even worse for a cheap one.
Some of the clear blue blockers have strong blue *reflections*. I'm guessing that the whole thing is about the antireflective coating. If the coating allows more red to come through, and the blue is reflected normally, then the reflection will look blue. So thats what allows them to say that it blocks blue, but its miniscule amount. I wouldnt count on it to have any effect on top of placebo.
I commented this on a previous video (maybe one about lights) but the two biggest factors that contribute to eye-strain are the light intensity and the distance to your eyes (EDIT: regardless of color when talking specifically about eye-strain, and specifically blue light when talking about sleep difficulties). Obviously, the further you are away from light, the less actual light reaches your eyes. Anything that filters light helps because no matter the wavelength, it will cut down the overall light intensity anyway. The yellow glasses filter more and thus, work better. I purchased a similar pair of your Amazon glasses myself and they did have a subtle effect. For you (and anyone else struggling with eye-strain) do the following: 1. Keep your monitors as far away from you as your desk allows. Scale up text if you need for readability. If you're on a mobile device (phone or tablet) hold the device further away from you. Also try holding the screen at a slight angle so that it is not perfectly perpendicular to your face. Not only will this reduce light intensity towards your eyes, but it is the simple fact of holding anything up close for long periods of time (i.e. even reading on paper) that has caused eye-sight problems for humanity over the past couple of centuries. This leads the next point. 2. Take breaks! Even taking 15 second breaks every 15 minutes will dramatically reduce eye-strain. When taking breaks, look at objects (but not lights obviously!) that are further away so you exerecise your eyes ability to focus on things at a distance. Making this a habit will help eye strain significantly. This should also be practiced whenever reading or doing anything "up close" for long periods of time. 3. Reduce your light output! I lowered my screen brightness incrementally over several days for my eyes to get used to a lower output. Once adjusted, I'd increment the brightness again until I reached a point that I felt was ALMOST too dim. ALSO, reduce your ambient light! I know you have smart dimmers! I saw the video! The best thing would be a warm colored task light (such as a candle at your desk or desk lamp with a
Also, you can get reading glasses. The muscles around your eye that use use to focus weaken as you get older, so it takes more 'strain' to stay focused on close objects, whereas when you're younger it's not an issue. Reading glasses move the effective focal distance away, and solve the problem. They're also extremely cheap.
As I recall, LED's are incapable of producing white or blue light directly. Instead they are made to produce UV light, and then the "clear" potting compound that molds into the "bulb" are doped with UV fluorescent compounds to produce the blue or white light. This is why there was a nearly 20 year lag between the develoment of the original red LED and the white and blue ones. So, it probably wasn't difficult to produce LED's that superficially emit blue light at a minimal amount while allowing a large portion of the UV light to emit directly. Heck, the LED's might even be manufacturing "seconds" rejected during manufacturong for having insufficient phosphor content.
The fact that they sell these glasses with this stuff is just so ridiculously suspect. It's like buying a five-pound bag of flour that comes with a spring-scale that you can use to prove to yourself that the flour is totally five pounds even though it feels like only two pounds and takes up the space of two pounds and doesn't at all seem like some kind of amazingly densely packed super flour.
I thought you wrote "seeing is for chimps", which would have been an excellent zoology joke. (Primates have very good vision compared to most mammals.)
@@travcollier How would that have been excellent? It has no relevance to anything I said, nor anything in the video - it would just have been a random fact.
@@Asdayasman I think it is funny. Humans are pretty much chimps. We're quite vision-centric, but most animals aren't. It is a play on words with multiple levels. Nothing super profound, just thought it makes for a clever joke.
They put phosphor that absorbs UV light and radiates blue light around the sides of the bulb to make it reflect off the internal reflective surface. This is something a large number of near-UV LEDs do to help visibility, but they are doing it here to scam the consumer.
CFL tubes will glow when hit with UV light, because (spoiler!) all CFLs and TL tubes actually only emit UV light. The inside of the glass enclosing is painted with a substance that converts UV light to visible light. This used to be mercury, which is why you had to bring those tubes to a collection point, but nowadays is much less environmentally horrible. Pointing a UV light at the coating that converts UV light into visible light, converts it into visible light. So yeah, it'll light up in non-blue.
I know, I know, you're all just trying to be helpful I'm sure, but:
•I know what f.lux is and I use it. I'm not sure that simply reducing the output from the blue subpixels is necessarily eliminating all of the melatonin-suppressing wavelengths produced by the backlight. I also realize that sounds like homeopathic paranoia, but sleep cycles aren't my only issue anymore. See the following bullet point.
•Eyestrain is my primary concern for during the day, and I don't use f.lux during those hours. Plus I can't for doing color-sensitive work, and if the clear glasses do help with eyestrain somehow, I will take my stupid human brain being convinced by a placebo over more eyestrain.
•I intend to use the yellow-tinted glasses after sunset to ensure all sources of light are filtered. I don't live in the dark, ya know.
•If I continue to experience issues with eyestrain I'll see an optometrist but I know for sure it's working in front of a backlit screen that causes that. A day away from the computer is always strain-free.
This is all just me seeing what works. I'll continue to report as my journey continues.
Take more breaks and see the optometrist about getting some prescription glasses with specific lenses to block the specific bands of light and at the depth suitable for you and not some random glasses from the internet
Those remind me a lot of my prescription glasses, which (in addition to making the world not be blurry) are supposed to block UV light and some shorter wavelengths of blue light. I experience the same slight "yellowing" when looking at a white computer screen with them, but the main point of mine is to block UV light.
No, that’s all fair, especially if you’re already using flux.
2 things, have you considered that your eyestrain could be caused not by the light, but your eyes focusing close up for hours on end? Secondly during the day you should consider trying neutral density sunglasses that reduce all light evenly if you can't reduce your display brightness. Your eyes should adjust to it and still allow you to do color sensitive work.
I saw and optometrist and got glasses that do help. I stare at screens 10hrs a day... They reduce glare and move the focal point further away. It's the staring at something close that causes strain. Humans are not meant to look at things two feet away from them all day and it literally strains the muscles in your eyes to keep your cornea flexed into a shape that allows you to focus there.
Super late comment but here goes:
I got the same kind of glasses with provided test card and light. My standard reading glasses also blocked the "blue light" from the light. I tried the light on my glasses with transitions lenses and it immediately made them darken. Since transitions work with UV light, I think it confirms that the light they provide is actually UV. Finally I used my UV LED nail lamp on the test card and it instantly turned blue. I think it's safe to say it's all just UV.
Sounds like a false advertisement lawsuit.
@@Leekodot15 good luck with that, these are just random chinese companies that made amazon accounts
On the plus side you now have a UV flash light.
@@HadenBlakemhm, a pair of nice decorative glasses (for looking smart) and a unique blue-tinted UV flashlight~!
;P
Most lenses from reputable companies already have UV protection built into the lens material. CR39, polycarbonate, and Trivex all have UV protection.
We need a Technology Connections 3.
No scientific method.
No cursory examination.
Just pre-lingual grunts and throwing things across the room.
omg i imagined it
:D
With more toast!
Toast is love, toast if life!
Technology Disconnections
@@satisfiction Technology Destructions
or Technology Distractions?
I took the card outside and ... woah! It turned blue!
So *that* means the sun has either some blue light in it... or some UV.
_perplexing intensifies_
🤔
The clear-y lenses have a UV filter in them, full stop. It's pretty normal for good glasses, and it's there to protect eyes from UV.
Nothing about normal blue 😂
czcams.com/video/hx2MTHCzI34/video.html
I was yelling at the screen "take it outside!"
put some broad spectrum sunscreen on the card, then test with the light and sunlight. If it doesn't change, then it is reacting to UVB and UVA light
"Here's something to detect blue light!" Thanks, could already do that. I have two highly advanced organic blue light sensors built in, and most cameras try to mimic them.
Those can malfunction, and I can tell you that they are not calibrated. Just use the tools that I included, they are working, and have been calibrated to give perfect results.
If anymore questions, feel free to contact customer support, they are available anytime. Thank you for buying our products, and have a good day.
John Simun Lmao nobody is buying your product or your bullshit
@@BL-xz3ym r/whoosh
Jean-Louis Bourgeois if the company says it was calibrated, they calibrated it. It’s in black and white.
Do I need to whoosh all of you?
Fine, you get a whoosh, you get a whoosh, you get a whoosh, everybody in the audience today gets a whoosh. These whooshes are provided by satire. With satire, you can make a joke that goes over people’s head.
I love how the ‘test’ they provided to prove their product works is the very thing that completely debunks their claims…
Only if you actually want the truth. If you want to believe them, to justify your purchase, it "proves" that it "works".
Those are UV-blocking glasses mislabeled as blue-blocking. The test torch contains a UV LED. Those tend to be about 395-405nm. They appear dim purple because this is a very near UV, not yet invisible. Things look blue under such light because of fluorescence.
In fact it is more a far blue LED that also output some UV-A.
@@godzil42 UV LEDs usually have a second purple/blue LED build in to tell the user it is working, as humans don't see UV.
shepardpolska UV C LEDs yes. But that torch is a Blue / near UV A one. They don’t provide a free UV torch with an LED that cost something like $20-30 which is probably just by itself more expensive than the two pair of glasses he bought.
@@godzil42 They do it with all UV LEDs since you can't see any kind of UV with your eyes. At best it would be like the IR diodes in remotes with UVA. But it might be a far blue 410nm LED. Those don't output any UV(atleast not enough to have any effect on anything) but have similar effects to UVA
@@shepardpolska that's completely wrong. Near-UV LEDs (e.g. for money bill testing) emit around 400nm, which is perfectly visible and appears as dim purple (commonly called blacklight). This wavelength can trigger many fluorescence reactions, and "whitening" dyes (in bleached paper or clothes) fluoresce in bright blue so the stuff appears shiny white under normal sunlight. Specific dyes can fluoresce in any color under 400nm blacklight, but this "UV" light is still visible, even if just barely. It makes no technical or economic sense to combine a 405nm "UV" diode with a 430nm or so "blue" one. It would double the price for no reason.
The reason it looks different in the bulb is because the inside of the bulb is coated in phosphor that absorbs UV and emits visible light.
Science stuff, just as I expected
That would be true if it were a florescent bulb, but that is (most likely) an LED bulb which does not have any phosphor, it is just white plastic to diffuse the light from the LED.
Doug Perrenoud
I would think the plastic reflector is what would be coated not anything with the diode.
@@dperreno There is phosphor but only directly on the LED.
Lots of random stuff fluoresces under long wave uv. Most white objects in my house fluoresces the same hue of the bulb under the led. (Yes i do randomly shine uv lights on thing) Most reflective surface (notably lamp Shades) seem to reflect the uv light back as seen with the led and the lamp shade. I have also seen a rock that held similar properties to that test card's color change. What he had bought are the first stylized uv blocking glasses i have seen.
That card is detecting uv. It's used in fiber optics for testing whether a uv fiber is transmitting.
Exactly. The glasses are UV shielded, which is why there is a tiny amount of yellowing, since it's blocking a tiny amount of blue.
I have that exact UV flashlight for a magic trick involving a card reveal in invisible ink. Definitely not "blue light."
To be fair, UV is pretty blue
Woah that's a cool magic trick. You ever been on penn and teller fool us?
For a magic trick? Save some pussy for the rest of us dude!
I have one that came with glasses, and I figured out it was UV when it would immediately charge a glow in the dark nalgene bottle that I have. It's actually super cool, you can draw on glow in the dark stuff with it.
@@cix8836 haha nice
2 minutes in I was like "This sounds like Technology Connections". I'm a dummy
Same here :(
Yup yup, me too
I thought it was. Only after several minutes did I realise my mistake. I thought it was a weird video for him so checked the name again and realised it's not his main account...
I watched this video a couple months ago, didn't think much of it. Recently found Technology Connections, watched a couple videos, and decided I'd sub to the channel. Just now realized they're the same person. Had no idea who Technology Connections was when I first watched this, and didn't remember this video when I subbed to him.
@@aidancommenting I thought technology connections and captain disillusion were the same person briefly....
Shine the led on some money, they have UV markers in them. Also test the card thing using regular glass, that should block uv as well as these placebo glasses.
Window glass has a significantly more gradual UV cutoff than plastic prescription glass lenses with the usual UV-blocking treatment, like you get on all prescription glasses nowadays pretty much. These generally have a slightly yellowish tint that you can might or might not see depending on the frequency spectrum of the white that you're judging them against, because the cutoff is quite close to the edge of the visible spectrum just slightly encroaching on it, and the cutoff is very, very sharp.
Which i bet this is what these clear ones are, just glasses with standard plano lenses from a prescription lens supplier. Which is to say, today's prescription lens tech can be quite impressive even from the super cheap suppliers.
Was going to suggest that, or using a postal stamp (at least in Canada they use UV sensitive ink in their stamps, don't know if the rest of the world uses UV sensitive ink in their stamps).
@@SianaGearz Yep, Ben from Applied Science tested it, and regular glass doesn't really block UVA.
@@GRBtutorials I guess my "UV sensitive" transitions lenses are specifically UV B sensitive then. No matter how sunny, if I'm behind window glass, they don't get dark at all. Outside, very overcast, they still get about 75% dark.
Cheap "plastic" lenses are made of CR-39 resin, which conveniently blocks UV all by itself. It's arguably a better material for glasses then the slightly harder and more expensive polycarbonate they try to up-sell you on, as long as you don't need a huge refractive index.
Classic quote from the ANRRI website: "Customer satisfaction is worthless." Priceless.
Holy crap. Who the hell came up with their copy? That's a disaster 😳
Someone must have written that in blue text, and the copy writer couldn't see it because of their glasses!
I went to their site and, upon seeing that for myself, laughed uncontrollably for several minutes. Thanks for sharing!
Just as good as the infograph that's titled "Where is Blue Light?" with an arrow pointing to a laptop saying "Everywhere"
The reviews on the website look pretty fake in hindsight tbh.
"I want to reduce the amount of blue light I see" *Looks directly into a Blue UV Light pen for 5 minutes*
mmmmm ultraviolet
@@TheAechBomb blue light is in the high spectrum, yes, that thing can reach UV but still is mostly on the blue side.
Another term for "very purple" might be "ultra violet"...
Hmmmm. 🤔
smartass to the rescue----
but "ultra" in the case of "ultra"violet doesn't mean "very", it means above - above as in, above the normal violet light - think of "ultrasonic"
@@zicklane what the hell is ultrasonic lol
Violet is a color of the spectrum (a pure wave), purple is mixed light.
You should have also checked the light provided on an ID, passport, or payment card. All of those have UV sensitive regions. Visa cards have a V printed over the Visa logo, MasterCards have M C on the front, AMEX cards will say AM EX on them, and Discover cards have DISCOVER on them. The ID page of a passport is also UV sensitive, as well as most drivers licenses (varies by state/province). Other IDs may too (NEXUS cards are kind of holographic).
And some banknotes as well.
If you have a dollar thats denomination is over 1, there's a security strip on it that's supposed to glow a different color under UV light.
They blast Eiffel 65 towards each LED in the factory.
Yo listen up
Here's a story about a little guy that lives in a blue world
Ahahahahahahahaha! Priceless!
da ba dee da ba die
The bulb looks blue while the reflection from the lamp body looks more purple because the bulb is coated in a material specifically meant to absorb UV, to prevent UV emission from the bulb itself. My guess is the LED is deliberately emitting both UV and blue wavelengths. Take that flashlight apart and let the sun shine through the lens portion, or just look through the lens in direct sunlight. I bet it will have a distinctly blue tint due to UV phosphorescence.
pretty sure they just have two LEDs in there, you could see the 2 connecting wires and the common anode
IIRC the bulb coating actually converts the UV into visible light. Without the coating it is a UV light like you used to see at night clubs. White LEDs use a coating for the same thing.
Hamsterdave is correct. There is a phosphorous coating to absorb UV light
Do NOT look through the lens in direct sunlight.. or at least at the sun.
It's actually a UV fluorescent coating in the bulb to absorb the UV and re-emit in the visible range. If you use diffraction grating glasses you can see the coating emitting in a few discrete colors that combine to look like blue-white glow.
"I think it's because... uhm... [huge pause] I don't know"
Now that's the quality content I subscribed for. Keep up the good work!
The moment you showed the test card I called it being a UV light; I've been an optician for 12 years and we had similar tools to activate Transitions lenses which *need* UV to work. I can say that proper blue-light blocking anti-glare does significantly reduce the amount of blue light that reaches your eyes; while this particular product is BS, the general concept of blue light blocking is legit.
while the concept of blue light is legit i feel like there are alot of fear mongering involved in the marketing making people feel like they cant live without them
@@menacetosociety9076 Blue light is more common now than ever before. That's why you hear about it more now than ever before.
@Jacob Faseler The abundance of blue light we exposed ourselves to is still a fairly new concept. One thing studies are still out on is whether over exposure can contribute to macular degeneration. So, while you may not see their usefulness unless you stare at a screen all day, you are not entirely correct that that's the only benefit.
I for one have a family history of MD so every pair of glasses I have include blue light anti-glare. I'm curious to see if there's an uptick in cases over the next few decades.
I have Transitions lenses in my glasses. When a family member bought some blue-light-blocking eyewear for us, the first thing I thought to do was point the test light at my glasses.
Also, because I have around -5 D polycarbonate lenses, the ever-annoying chromatic aberration lets me easily see that the yellow-tinted lenses do indeed block some blue light.
@@jlco You should consider doing hi-index lenses for your next pair. Much thinner, and poly has the worst chromatic aberrations of all popular lens materials anyway.
You should have tested the torch against the card through your amber glasses, just to see what happens.
I'll bet the amber lenses would have blocked it. Polycarbonate and many plastics *inherently* block much or almost all UV light.
*no one probably cares about this*
This is the level of nit-picking I live for!
You sir need a prism/diffraction grating, it would be a way to tell what you are dealing with.
The "clear" glasses could be notching out some common for lasers wavelength,
but it is impossible to tell from a 3 channel(RGB) video.
@School's Out: Screw Around Actual diffraction grade made for that purpose are much better than a broken DVD. I have made spectrometers using DVD pieces, prisms and diffraction grates; the one made with the actual diffraction grate is much better. They are cheap, IIRC I paid about $10 on Amazon for a package of 25 of them.
But yes in a pinch for a quick and dirty test, a piece of broken DVD works too.
If you have glasses with a strong enough prescription you can even look through the edge for a really rough approximation of all the wavelengths in something you’re seeing.
@School's Out: Screw Around +2 points for "distraction" grading of DVDs.
what about a 4 channel (RGBY) video?
It is a UV LED with just one die. But they added fluorescent dye in the epoxy casing. This is common with UV LEDs so you can easily see that they are on.
Forssa1 But you can see the second die right in the video. It’s got two dies, one will be UV to expose the card and the other blue to trick the consumer.
@@tookitogo Actually quite a lot of UV LEDs shine blue we use a ton of them at work for detecting leaks and every single one of them has that really blue colour.
Himmel Then by definition they’re not UV, since ultraviolet light is invisible to the human eye. More likely, they’re near-UV, which many fluorescent items react to as well.
I have UV LEDs, and their glow is a nearly invisible pale lavender color, from the small amount of visible light created (since an LED’s light is centered around a wavelength, but does produce tiny amounts of off-center light)
Himmel Or they’re deliberately using UV and blue LEDs in the lamps, to make them visible to the naked eye, so you won’t stare into them, or to make it easy to see if they’ve been left on by mistake, or something like that.
@@tookitogo Given the damage you can do to your eyes with UV light, I wouldn't be suprised if it was a standard safety feature.
One way to test if an led has multiple diodes seems kinda silly, but it’ll work. Turn the led on and hold a magnifying glass in front of it. Put the led at the focal point of the glass and you can project a large image of the diode itself on the wall. The leds I’ve done this with were only one color, but a couple had multiple wafers making up the diode. They are easily distinguishable from each other. But as others have pointed out, the one here is a uv led. They’re mostly just purple/blue with a *very* small amount of uv mixed in. You was getting the purple and blue separated like that probably because of refraction from the casing of the led itself (the same type of refraction that causes rainbows)
These people hired me for an add awhile back, omni or whatever using the same tools etc. Never paid me. Was pretty annoying
the glasses makers?
@@lukasloen4659 yep
@@Moliminous so you did an ad for a shady company and didn't actually test the product to see if it was fake?
and you DIDN'T get paid? Shocker!
@@ballsrgrossnugly Shady company xD
No wonder. If you don't know that the abbreviation for "advertisement" is "ad", you are most likely not capable of creating an ad.
Ah, the slick and oily feel of Snake Oil.
Made out of 100% All‑Natural Oil.
It is oil
Here I am, right before I'm going to bed, looking at a video OF BLUE LIGHT. Smart.
its okay if you are in protective googles! But then the video would not be that appealing XD
Right there with ya, bud 🙄
“Through the magic of buying two of them...”
Hahahaha not AGAIN!
For a while I wore amber tinted sunglasses because they helped with light sensitivity issues. If you find a good pair then it's a really weird experience, even a bright blue light looks grey and very dim, and blue objects are close to black, but after a little while wearing them you get used to them and most other colours look normal, until you take them off and suddenly colours are way brighter than usual.
If I could do it without getting weird looks I'd wear something similar all the time.
nah just imagine that you're Tyler Durden or something. maybe even fight yourself afterwards so more people get the reference
those are laser goggles and not intended for computer use.
the clear glasses are blocking the uv light that you want to stop.
seriously guys if we didn't want blue light from our monitors we wouldn't put blue leds in there.
I've just accepted the weird looks at this point. Being able to just *shop* in a *grocery store* with *fluorescent lights* without feeling like I'm going to die is worth the tradeoff, for me.
@@estaworks-3d102 Of course we want blue light from our monitors during the day otherwise colours would look all weird, the thing is that the blue light can stress your eyes and be very uncomfortable when it's dark out as well as potentially impact sleep, at least for me that is. So light filtering glasses or programs that reduce or eliminate that blue light makes a world of difference in terms of comfort. My eyes hurt significantly less when using f.lux at a very low colour temperature.
I got a set of those a couple months ago for night driving, i work in grocery stores for abt 12 hours a day and can say it definitely helps with the eye fatigue i get from being under bright flourescent and LED's all day.
This reminds me of an infotisement for some "miracle car finish" from back in the day. To demonstrate its protective abilities, they pointed a blue laser at a red car, which burned the surface. Then, they applied their product to another car... a WHITE car... and hit it with the laser. Oooo, ahhh, no damage!
Soccermoms are convinced.
The card has a coating that absorbs UV and then emits visible light. The diode is certainly an UV diode. You can use some dollar bill and shine the LED o them to prove it is indeed UV.
It’s not a definitive “UV” test as they will fluoresce beginning with blue wavelength light (which has enough energy to begin activating many fluorescent colors) and by the time you get to violet your getting so close to the start of UV-A that the effect is very similar as it’s all a continuum. The LED is likely a 395-405nm violet to very near UV-A source (the transition between violet and near UV is 400nm). Polycarbonate has a very sharp cutoff at ~400nm which makes it very good for blocking anything from near UV-A through UV-C. A better test for UV versus violet is to use a known polycarbonate lens or plastic sheet and to shine the LED on a fluorescent source through the polycarbonate. If the polycarbonate blocks or very substantially attenuates the fluorescence versus without then you know you are dealing with an LED on the order of ~395-405nm violet to very near UV-A (anything with a shorter wavelength will no longer have an observable violet tint and anything much longer would appear blue to indigo).
Ongun Kanat so you're saying that if he does this in the dark, the card will glow after the flashlight turns off?
Colour me skeptical...
Pingu McPing That isn’t what the OP said. His comments are in reference to the fact that the card is emitting light in the visible blue spectrum by “stealing” energy from the UV spectrum and then emitting that borrowed energy in the visible blue spectrum (fluorescence as opposed to phosphorescence).
@@ethanpoole3443 that's exactly what he said and now you are too...
Pingu McPing With respect you are confusing fluorescence (the re-emission of light at a lower or higher wavelength) with phosphorescence (sustained glowing in the absence of light, as in “glow in the dark”, due to previously stored energy). Fluorescence is not “glowing in the dark” and these cards (and their like for other wavelengths) fluoresce while exposed to light of suitable wavelength. If you would like to learn more about this phenomena then you may wish to visit the Applied Science channel where you will find a recent video covering this same effect in considerably more detail.
That is a "royal blue" LED. They are used as a pump LED for white phosphor LEDs. They are in the 395nm to 405nm range. They are right on the border of UV/Vis.
Those glasses are nothing more than simple uv filters, like what are used on higher end cameras.
Those testing cards are almost identical to the ones we used to use when I worked in tech support to test whether or not infrared remotes were working or not.
2:55 most white pigments glow blue when hit with uv.
Why
I'm good at chemistry, but I don't really understand the science of flourecence. It has something to do with how the molecule of dye is shaped.
Edit: Most white plastics contain phosphors, so they flourece under sunlight which makes them look very white. The UV in sunlight is not much, which is why white plastics dont glow brightly, but UV lights emit stronger UV, so they glow.
@@EdwardTriesToScience i appreciate the time you take to research the answer to answer the question of some that just consist of "why" 😂👍
Oh good someone said this. Its phosphor pigments that glow close to natural night and that's what's in fluorescent light bulbs and some of the soft glowing LEDs I believe.
So not blue blocking glasses but uv blocking glasses, maybe you could sell these as a concept for protecting people’s eyes in bright sunlight, and maybe you could call them sunglasses. Forget that I doubt it would ever catch on.
Who would want to use sunglasses anyway?
Perhaps tint the lenses gray to make bright sunlight less bright as well? Nah, would never work.
you know the thing that block UV? yes, Polycarbonate, a.k.a, cheapo transparent plastic. Soooo..... yeah.....
Are you dumb it’s called solar spectacles it was invented in the late 18th century and the modern day equivalent to the blipgon
I'm an electronics technician for an LED light company, it looks like a single die with 2 bond wires [/Cunningham's Law]
It is a likely a ~405nm LED or laser diode in the tester.
There is absolutely no way there is a laser diode in something as cheap and hokey and intended for clueless average consumer use as this thing.
400nn discreet LED. Cheap, bright, easily available, and no safety warnings required.
I'm 95+% sure.
I'm holding a 405nm laser right now and it behaves exactly like in the video. If i shine it on some objects its violet and others it turns brighter and bluer. Shining it on some plastics even makes it a bright white beam. My guess is that the violet laser is able to excite the UV fluorescent dyes that's in things.
@MyGodisYahweh $5 is not at all cheap for a piece of crap add on thing like that keychain. There is no way they would have bothered if it cost more than about 20 cents.
@@jak231 A 400nm laser diode looks absolutely nothing like what is seen in this video. ummm....Divergence? Speckle? Intensity? Hello? Stop. Get some help.
I feel like I'm getting cataracts from just watching this.
He should have warned us to put on our UV blocking glasses before shining that UV diode in our eyes.
I used to work testing blue light emissions from LED sources. Generally we were looking for 455nm which is the colour used in most white LEDs used in general lighting and LED backlight sources. Just for kicks I did test both the dark yellow, blue light blocking safety specs we were required to wear and my prescription glasses with 'blue light' filtering coating. As you can imagine the safety specs did block pretty much all the blue light, my prescription glasses reduced it by 30%. Looking at the specs you have compared to mine I'd say they will do something... but not an awful lot.
"The goggles, they do nothing!"
I understood that reference!
😆
Bravo
Up and at them!
@@GoogleDoesEvil Damn, I was just telling someone about Is It A Good Idea To Microwave This? earlier... I miss that show.
Most banknotes have some sort of security features that are UV-reactive, you could try shining it on banknotes and see if the security markers light up
Yes please
they also work to absorb up to 450nm
Me, a colorblind person:
"Wait, you see purple?"
@coolkid let me guess...it's not blue...
kronos6948 since no one told you : it could not be more purple
@@lucasmironne3578 It's purple, but it's kinda close to being a dark blue. ... Monitor type and quality may make colour results different (and also how much gamma is set).
@@Poodleinacan It's damn well purple and nothing else, dude
@@Poodleinacan Maybe you're colorblind as well, because their PFP is a deep violet, or a royal purple color. No mistaking that for "blue".
For mine, it's honestly less about the monitor blue light and more about the surroundings. I work in an office, and the ubiquitous fluorescent lights get turned in to a slightly 'warmer' color temperature that makes things a lot more enjoyable. Plus, they're basically reading glasses.
Welp, that was probably a useless anecdote.
dw i liked it.
I'm currently wearing a pair of Gunnars with their latest "Clear" lenses, which are around a 5% amber tint with their coatings. I'm appreciative that they make the neutral white of my display look comfortably warm without me needing to jump through the hoops of trying to color calibrate a setting to cut down on the blue without making the colors look horrible. I've had less problems with eye strain since purchasing Gunnars years ago, so I'm content to keep doing so. $300 for a pair of decent prescription glasses that don't leave my eyes feeling utterly exhausted after only a few hours of looking at a screen is a VERY cheap price to pay. I am envious of the people who don't need glasses to see properly in the first place, though.
Fun fact: glass (that very common glass that is) absorbs around 80% of UV, that's how your mirror blocks it so easily (it is both pretty thick, and then light has to pass it twice). The bluish luminescence can be due to either the crystal coating, or even the reflector material. Most likely a safety feature of the LED, as UV is barely visible so your eye doesn't react properly to one's intensity, which can damage it therefore.
A uv flashlight is pretty cool though. Even if the glasses are a scam.
I have a UV flashlight with 9 diodes. It's a lot of fun to mess with at night - I apparently have a bunch of things in my room that are UV reactive (no, not the stains on my bedsheets. Weellll, not *just* those anyway ;) ) like certain words on the spines of my books, some of my Lego pieces, which was super creepy at first as I mostly have Bionicle sets and only the eyes light up...
Optical engineer here. It's probably a 405 nm source, it there abouts. It's right in the edge of uv/blue so depending on how you look at the beam it will appear like that brilliant blue or be a little purple. Most of the cheap ones are fairly broadband and some even bleed down 20 nm into the UV. The card is seeing uv, maybe kinda sorta, some of those cards have broad detection bands and the boundary is soft. There are plenty of glass types out there that clip at or around 410 nm and are still largely clear if they're thin. I'm guessing we have a combo of just the right glass, card, and source. Do take away? They won't do squat. If your eyes are young wavelengths down to 380 nm may be visible but I'm real terms nothing below 400 nm is relevant or detectible enough to cause eyes strain. The blue light theory is a little goofy anyway. Sure, narrowing the band will always help with focus but it's not magic.
Go to the doc and get tested. I got tired of dealing with my eyes strain and they found a little astig in each eye. All day working with the glasses and I no longer feel like I'm going be 8 at night.
Anyway - yeah, it's a scam. What a wildly stupid scam too - there's no way that little torch costs them less than just putting a proper amber tint on the glasses.
I totally agree. I thought that same thing too. Except imagine how many more of these that they sell because they don't have the stupid yellow orange color but they 'still work just as well'. Stupid like a fox!
UV LEDs, some small batteries and a generic torch case is gonna be much cheaper than the lenses
You could've used the Blue/UV LED with a dollar bill.
Singles don't have a strip, only $5, $10, $20, $50 and $100 bills do.
I've had to use UV bill checkers at my last two jobs, so I've checked $1 bills.
7:01 Lower the battery voltage - probably replace one of the coin cells with a carefully crafted wad of foil. Best results from using a voltage supply you can dial up the voltage until you find the diod(es) forward voltage.
They start as faint glowing specs that are easy to resolve
Shine it through a prism, seperate the frequencys and move the card on to each one to see what happens.
Just a daft thought :-D
crazy like a fox.
I suspect you've probably looked into it already since you mentioned eyestrain as a complaint. But have you had your sight measured by an optometrist recently?
A few years ago I started noticing that I'd get headaches halfway during the work day, initially I blamed it on the building air processing system (which was a bit bad on that wing). But then I noticed that while working in the same wing while having a few more meetings and other away from staring at a monitor 99% of the time work I didn't have it there. So turned out that when I had my eyes measured that I needed a different correction factor for long distance and monitor reading distance.
It was a small difference:
long distance -4.00 (L) -4.75 (R)
monitor distance: -3.25 (L) -4.00 (R)
This might not seem like much, but it pretty much made the eyestrain and headaches go away. Getting into the habit of using a second pair of glasses was a bit annoying but now I've reluctantly accepted it as a thing I need to use when planning to spend more than 15-20 minutes at a monitor.
Eye drops can help. Never knew until after LASIK how much eyestrain could be from just dry eyes. I still buy those lubricating drops they gave me after the surgery because of that.
I had headaches at work that I thought were simply overstimulation turn out to be shoddy adapters, solved by simply swapping over to DVI and VGA cables (whoever hooked it up obviously didn't have the right cables and an overabundance of adapters because there were completely pointless adapters in the mix making the picture slightly out of focus and haloed)
UV light will make titanium dioxide based pigments fluoresce blue. It was clear when the bull pigment went blue but the lampshade was purple (and the blue of the test card).
I love how half the comments sound like Mythbusters test proposals. The nerd in me is thrilled. I'm so proud of you all!
More modern research states that blue light doesn’t have bad effects anyhow. The reason blue light keeps you awake is just because your using a screen, and taking in information. Doesn’t matter what color.
My wife uses the clear ones you have and, I too, am skeptical of whether they actually do anything. But I'm not going to tell her or show her your video because I think she looks pretty hott when she wears glasses. Placebo effect or not, they work for me. 🙃
"i'm gonna keep information that might be important to my wife's health from her because i like my boner more" yeaaaah so did she know what an asshole she married?
No woman looks hot wearing glasses.
iconoclad you're either insane or you don't have a clue what you're talking about.
@@LeicaCat Sooo many TV sitcoms and romcoms where the plain librarian takes off her glasses, shakes out her hair and is transformed into a beautiful woman. Again, no woman looks good in glasses. Just like dudes in baseball caps all look like idiots.
iconoclad well it's a good thing that ice cream comes in many flavors. 😉
Why not just use a prism to determine colour spectrum and compare with and without glasses?
You'll need a actual analyzer for that. Normal glass prisms don't pass uv spectrum very well and even if you get a quartz prism an optoelectronic to detect it since people don't see uv light. Anyway if he does have access to these equipments he is going to have more understanding of "blue light" thing and GaN LEDs and not making this video
@@seldompopup7442 He is trying to measure blue not UV
@@seldompopup7442 But the test is just to see whether it is actually the blue light affecting the test card. As far as I'm aware, UV light and blue light don't pass through any commercial prisms at the same angle as each other, so it should still work for that test -- just shine the light through the prism, hold the card so that the refracted blue light is hitting the reactive area, and see what happens.
So it's a uv blocking pair of glasses. That has its uses.
All glasses, at least that are sold/manufactured in the US, block UV light.
Most plastic glasses inherently block UV light.
well, now you're just assuming that they block 100% UV. I wouldn't trust them on that
@@roceb5009 touche. But most glasses do that by default anyway.
its false advertising though
You could have used some sunscreen to block part of the reactive film
The reason it looks different on the light bulb to the lampshade is that the white 'diffuser' on many bulbs likely has compounds in it which shift the light from UV into the visible spectrum, this is useful so that any UV light created by the bulb itself isn't wasted. Also on the note of placebos be aware of the opposite effect that if you expect something to not work then it's much less likely to do so.
Yep, phosphorus on the inside of the bulb!
Headline: "Persnickety white man yells at glasses"
Seriously though, I absolutely love your stuff. This is a great off the cuff channel. I subscribed because you led me to the perfect toaster on your main channel (found one at a second hand store), and your exploration of tech stuff just makes me smile.
I'm betting that's near UV ~405nm LED wavelength same as the diode in a blue ray or HD-DVD player. I took apart a HD-DVD add-on from an Xbox and made a laser pointer back in the day, had the same look. I would almost guarantee you're suspicious is correct based on my 2¢.
That makes even more sense. There must be some factory in China with piles and piles of unsold HD-DVD drive parts due to the failure of the format. Doesn't take a lot for someone to think about transforming the diodes into funky keychain torches with those super cheap cases.
Just out of curiosity, why did you do that? Was the drive broken, at least?
Razor Koopa I bought the laser carriage as a spare part not the whole drive so I assume it was either a part or scavenged from a broken device. I did it mostly because I could and there was no other way to get a near us laser pointer at the time and tinkering is fun. Now a 405nm laser pointer is trivial to find on deal extreme amazon and the other regular places.
I have an underwater uv light for scuba diving. It definitely puts out enough visible light that you need an amber filter to be able to see the phosphorescence very well. I suspect this is the same type of led.
I'm very impressed and confused by the UV blocking glasses. I feel like between the cost of the UV lamp, the testing card, and the UV blocking lenses, they're chewing through all the cost and more of using an actual blue-blocking lens instead, no matter how much more expensive that lens might be than the UV blocking lens. That's a lot of engineering to go through to "prove" your scam product, which has to cost more than just making a not scam product.
It's not about the cost. It's meant for if you're not thinking too hard; "Wow these are great! They totally block out the blue light and I can still see blue stuff!" And then you recommend them to a friend and give a five star review. Somehow they must have calculated that the extra sales from being "better" than the competition would be more profitable than making a product that's actually equally good and therefore has to compete by price.
A lot of plastics block uv, surprisingly. And they basically got someone to produce a blue led flashlight without the proper uv filters. They are probably making a decent profit per unit.
The product is eye protection against harmful blue light, and UV is harmful light which can debatably be considered blue (380-400 nm is somewhat visible, but UV). The labeling is misleading, but I'm not even sure if the amber glasses in this video actually provide benefits over the clear ones (and amber lenses make it harder to see blue things).
The problem with blue-blocking lenses is, they make everything yellow. This is unavoidable but annoying. But this company claims to sell super-clear blue-blocking lenses"that *don't* make everything yellow. It's a "superior" product, so they charge more for them -- twice as much! -- and include the LED light and card to "prove" that they work.
The real question is why did you buy "blue blocking" glasses that are not yellow? It's quite obvious it's a scam, images don't get to keep their hue if you completely remove a part of the visible spectrum in it. Unless it blocks a very narrow part of the spectrum in the blue wavelengths, but what good would those glasses do?
It's a UVA\B "curing" light for gel nail polish. The card is UV reactive for testing if the UV light source is strong enough to "cure" the polish. Also, purple isn't a color of light. After blue comes a light blue\indigo color before you can't detect light frequency with your eyes.
There is one more color of light before it becomes undetectable by human eyes, and that color is violet. After violet comes Ultraviolet.
The true rainbow is a spectrum, but to match the number of notes in a musical scale, 7 colors were named. Red Orange Yellow Green Blue Indigo Violet. The 7 colors of the visible light spectrum.
Indigo is also less intense in terms of brightness than blue, so I don't understand how indigo can be anything remotely equivalent to a light blue.
I wouldn't have thought to sell UV blocking plastic as a "blue light blocker"... Marketing is genius in its stupidity at times...
Why not use software like F.lux to block blue subpixels from being as bright?
Even built into windows 10
He does, but he finds it's not enough.
I do, but I'm willing to believe that some of the blue from the backlight does get bast the red and green filters. I'm also willing to believe that's entire bull excrement, but part of what I want to reduce is eyestrain during the day and when I'm editing my videos. Sure, I could do all the color stuff with f.lux disabled but I gotta tell you it gets really annoying looking at everything with that intense coloration.
I intend to wear the yellow glasses after sundown also just to reduce stimulation from the lights around me that aren't screens. There are plenty of those, too.
That doesn't account for any other screen or light that might be used. Glasses are FAR more versatile.
F.lux and make it so your screen shows zero blue light. If he still has problems at that point, it makes me wonder if he wears contact lenses. I used to have problems with eye strain when wearing contacts while on the computer, and by wearing face-fitting glasses to reduce moisture loss as well as blocking blue light mostly solved it. The best thing is to just not wear contact lenses while on a screen since the lenses will dry out quicker than your eye, and the lenses while shift easily, causing further irritation.
Hold the card up to the computer to see if it even emits that 'harmful' blue light that the test is supposedly for?
The blue on that test card looks exactly like the UV exposure test strips I use in the lab.
This is a card used to check for UV leakage in Lasers, I've seen it being tested before.
Completely useless for checking blue light as far as I know.
I assume it does lower eye strain cause it blocks UV light, there is always some UV leakage from every light source (the white light of your camera made the test card a bit dark also), but it's not a huge amount, so I'd say mostly placebo.
Have you tried using your orange glasses on the card? UV should get through if they only block blue?
They appear to have a UV blocker as well.
Most typical materials while appear transparent do block majority of UV light anyway.
Tanning lights use special glass which lets most UV through
@@spacejaga So... technically the orange glasses block a wider range? And the scammy glasses only block UV by accident? Ha. That'd be funny :D
@@Byter09 not like by accident, they just do block UV and the added hint of some coating kinda sorta maybe perhaps somewhat blocks a little of something... Or they might even be a special protective UV glasses for tanning salons.... Who knows what chinese were making them for when they got aproached by some clever turd who ordered batch to be made with his logo and sells them for 10x profit
My blue light glasses are between those two pairs.
Edit:
UV LEDs are all kinda blue, they aren't entirely in the UV band.
If they were entirely in the UV band we wouldn't really see them. UV is past violet/blue in visible light spectrum.
It will almost certainly be a violet to near UV LED between 395-405nm (the cutoff for near UV begins at 400nm). Anything shorter wavelength than that in a UV LED will have no discernible violet in its output. For example, a 365nm UV-A LED will not appear at all violet to the human eye (at least not an eye with a natural cornea - YMMV with implant corneas, such as post cataract surgery). Basically this LED sits in the cusp between visible violet and just barely touches the very near UV realm. A definitive test would be to introduce a polycarbonate lens or sheet between the LED and the UV sensitive test card (or fluorescent colors) as the polycarbonate has a very sharp cutoff at ~400nm and will pass no UV whatsoever (well, a fraction of a fraction of a percent will pass, but that’s pretty darn close the being “UV opaque”).
Worried about his health, and eyestrain. Buys Blue-light blockers. Looks into suspected UV source for 10+ minutes, providing commentary for us viewers looking at only visible spectrum footage.
Quality entertainment. Beautiful public service. We love you, 11/10, please don't ever do again.
Eyestrain is usually caused by tiredness in the ciliary muscles which control your lenses. This can be triggered by not having to focus your eyes for a while or holding something too close to your eyes. Blocking blue light does jack shit to prevent eyestrain. Any perceived benefit to blue light blocking is just placebo.
It's just me or someone else suddenly had an extreme urgence to watch bigclive channel?
"Rightey oh, let's take it to bits."
I have 2 UV led torches and they are the identical blue colour. And they definitely have lots of UV light because they set UV resin and UV glue.
That also reminds me of the "purple light" that my dentist uses to cure my fillings.
The audio at 6:25 made me think my right headphone can was failing.
I am very impressed with the creativity and trickeey of the advertising major who came up with this.
This is flat out just a hunch, but I think the reason you're only getting blue light back at 8:42 is because the mirror coating is on the back side of the glass, and glass almost completely blocks UV B and C light. Thus I'd imagine your purple reflection is off the front face of the glass, and the blue reflection is off the mirror surface
EDIT: I stepped away for a moment and began to wonder why your phone's camera would be able to pick up on the UV reflection if it wasn't passing through the mirror's glass. Then it struck me that most modern phone cameras are actually sapphire glass, and sapphire offers much wider ranges of UV B and C transmission
go to a motel 6 with that torch and some eyebleach
Put some Luminol into the mix and you've got yourself a cleanliness test kit. 👍
Shine the light through the amber lenses.
Blue light should be largely blocked.
If the surface reacts, it is probably due to UV.
But UV should be blocked as well so it proves nothing.
@@Surestick88 , he noted the card reacted in the sunlight.
Therefore, he can test the effectiveness to block the UV light by putting the card behind the amber lenses.
If the reacts, and considering it didn't -or very little- when exposed to the blue light from the screen as well as the white light from the phone, they do not block UV rays.
@@jizzlecizzle1388 Which he already proved with the blue light from the screen.
There's no guarantee the amber lenses block UV.
@@jizzlecizzle1388 The card strongly reacting to sunlight but not significantly reacting the phone's flashlight is already pretty convincing evidence that it is UV-reactive material in the card.
Just about any pair of glasses you'll find will block UV so I'm guessing you're going to have a lot of trouble finding a pair of glasses that won't help with that UV reactive card.
Automotive glass can also block UV. When I’m in my car, my Transition eyeglass lenses do not darken as they do when I’m outside.
Glas blocks UV. But glasses nowadays are often made out of plastic.
@@deadbeef16 those as well. It's actually fairly hard to find transparent material that doesn't bock UV
Skeptical spectacles.
There is a single LED, and it is a near UV. The glasses are NOT blue blocking. The true blue blocking, amber color glassed make the LED a bit dimmer due to removing the blue portion of the near UV light. These glasses MIGHT provide some protection when working with UV lights however, I would not use them for that purpose in place of properly designed and tested safety glasses.
send it to styropyro to play with
Hell yeah fam
His UV lasers would come in very handy
@@Seraph.G He would build a laser that would burn the "test" card.
I would love to see more of this. Like that Zerowater pitcher that comes with a water tester. I'm sure that's legit.
The water tester is legit, but it just measures how well the water transmits an electric charge. Aka the amount of dissolved salts or ions in the water, which does nothing for testing bacteria content or otherwise
Pretty much all UV LEDs look like what you showed. Might be fun to destructively take apart the little UV light and get a better look at the diode. Or get a spectrometer (of find a scientist buddy to collab with that has one) that can measure UV and test what wavelengths it actually spits out.
So in fact will every violet LED out there and even many cheaper blue LED's, LED's are more narrow band than light produced by incandescence but they are not monochromatic. The emission is typically on the order of 30 nm or so wide for a fairly good one even worse for a cheap one.
Hey there viewers! I see South Main in that shot. Eric is awesome!
Some of the clear blue blockers have strong blue *reflections*. I'm guessing that the whole thing is about the antireflective coating. If the coating allows more red to come through, and the blue is reflected normally, then the reflection will look blue.
So thats what allows them to say that it blocks blue, but its miniscule amount. I wouldnt count on it to have any effect on top of placebo.
I commented this on a previous video (maybe one about lights) but the two biggest factors that contribute to eye-strain are the light intensity and the distance to your eyes (EDIT: regardless of color when talking specifically about eye-strain, and specifically blue light when talking about sleep difficulties). Obviously, the further you are away from light, the less actual light reaches your eyes. Anything that filters light helps because no matter the wavelength, it will cut down the overall light intensity anyway. The yellow glasses filter more and thus, work better. I purchased a similar pair of your Amazon glasses myself and they did have a subtle effect. For you (and anyone else struggling with eye-strain) do the following:
1. Keep your monitors as far away from you as your desk allows. Scale up text if you need for readability. If you're on a mobile device (phone or tablet) hold the device further away from you. Also try holding the screen at a slight angle so that it is not perfectly perpendicular to your face. Not only will this reduce light intensity towards your eyes, but it is the simple fact of holding anything up close for long periods of time (i.e. even reading on paper) that has caused eye-sight problems for humanity over the past couple of centuries. This leads the next point.
2. Take breaks! Even taking 15 second breaks every 15 minutes will dramatically reduce eye-strain. When taking breaks, look at objects (but not lights obviously!) that are further away so you exerecise your eyes ability to focus on things at a distance. Making this a habit will help eye strain significantly. This should also be practiced whenever reading or doing anything "up close" for long periods of time.
3. Reduce your light output! I lowered my screen brightness incrementally over several days for my eyes to get used to a lower output. Once adjusted, I'd increment the brightness again until I reached a point that I felt was ALMOST too dim. ALSO, reduce your ambient light! I know you have smart dimmers! I saw the video! The best thing would be a warm colored task light (such as a candle at your desk or desk lamp with a
Also, you can get reading glasses. The muscles around your eye that use use to focus weaken as you get older, so it takes more 'strain' to stay focused on close objects, whereas when you're younger it's not an issue. Reading glasses move the effective focal distance away, and solve the problem. They're also extremely cheap.
@@takanara7 That makes a lot of sense! Didn't know that before, so thanks!
I love watching Captain Disillusion too!
reminds me of the ""blue light filters"" in google play that actually just add a red overlay to the screen, which even makes blacks red
Fortunately most newer devices seem to have proper night modes that actually remove blue light. At least my Samsung tablet and Xiaomi phone do.
As I recall, LED's are incapable of producing white or blue light directly. Instead they are made to produce UV light, and then the "clear" potting compound that molds into the "bulb" are doped with UV fluorescent compounds to produce the blue or white light. This is why there was a nearly 20 year lag between the develoment of the original red LED and the white and blue ones. So, it probably wasn't difficult to produce LED's that superficially emit blue light at a minimal amount while allowing a large portion of the UV light to emit directly. Heck, the LED's might even be manufacturing "seconds" rejected during manufacturong for having insufficient phosphor content.
The fact that they sell these glasses with this stuff is just so ridiculously suspect. It's like buying a five-pound bag of flour that comes with a spring-scale that you can use to prove to yourself that the flour is totally five pounds even though it feels like only two pounds and takes up the space of two pounds and doesn't at all seem like some kind of amazingly densely packed super flour.
I could watch your videos recorded with a gameboy camera
bring the test card into sunlight, i would turn blue from the uv of the sun
He did
Just wanted to compliment you on your icon.
Team Tau'ri.
You should use Dragon Naturally Speaking, and MicroSoft Sam, and just wear a blindfold. Seeing is for chumps.
Love you.
I thought you wrote "seeing is for chimps", which would have been an excellent zoology joke. (Primates have very good vision compared to most mammals.)
@@travcollier How would that have been excellent? It has no relevance to anything I said, nor anything in the video - it would just have been a random fact.
@@Asdayasman I think it is funny. Humans are pretty much chimps. We're quite vision-centric, but most animals aren't. It is a play on words with multiple levels. Nothing super profound, just thought it makes for a clever joke.
They put phosphor that absorbs UV light and radiates blue light around the sides of the bulb to make it reflect off the internal reflective surface. This is something a large number of near-UV LEDs do to help visibility, but they are doing it here to scam the consumer.
CFL tubes will glow when hit with UV light, because (spoiler!) all CFLs and TL tubes actually only emit UV light. The inside of the glass enclosing is painted with a substance that converts UV light to visible light. This used to be mercury, which is why you had to bring those tubes to a collection point, but nowadays is much less environmentally horrible.
Pointing a UV light at the coating that converts UV light into visible light, converts it into visible light. So yeah, it'll light up in non-blue.
Oh, ever wonder what those "blacklight" TL tubes are? Regular TL tubes without the coating.