Experiments on Ultraviolet Light and Fluorescence are performed by James Lincoln for the AAPT Films Project. Also explained are the three colors of UV and phosphorescence.
That was absolutely fascinating! You did a fantastic job demonstrating how the different versions of UV react to different things. Your information was great, your demonstrations were great, and your delivery was perfectly listenable. Thanks!
The polystyrene vs paper with brightener additive used to elucidate the UV lines of a mercury spectrum is especially well done. Minor correction - there's no luminol in glowsticks. They're various phenylanthracines and rhodamines.
Thank you so much, this was very informative and well put together!!! great work I have just purchased a UV flashlight 365nm and was playing around with it to see what i can experiment with!
At 5:01 You have solved the egyptian DJED pillar conundrum. They were bouncing sunlight off mercury mirrors or had mercury bulbs. The far UV (purple) would have heated the pillar at a specific band on the column = matching the hot part on the human body...
Thank you, that was very well explained! Would you do a video on UV-C sanitizing of PPE (Covid-19)? For instance: an 11W UVC fish tank sanitizing lamp, placed "x" inches away from a mask, needs to be exposed for how many minutes? And, there is probably a need to "flip" the mask over and expose that side to UVC too, correct? For example: an aluminum lined fish tank, with masks placed in it, with about 5 inches of distance from the UVC lamp. Would take 30 minutes (15 minutes each side or is the reflectivity from the Aluminum sufficient?)? Thanks again 😊
Good Day Sir! 🙏 Rohitkumar from India! Nice informative video. Just have a query, is the far Uv light and uv-c belongs to same class or its further sub categorised differently? suppose if we are able to produce UV-C light with a lamp, i.e. Higher frequency then will be safe for humans skin? Or it is also dangerous?. 🙏
So Mr. Lincoln, if you are seeing this in 2023...what would be the reason for purposely installing street lights with purple lighting around the world saying they shorted out and turned purple by the same manufacturer? Checkpoints to see what is in or on the human body for example? Hmmm?
Hello Mr. Lincoln, .. allow me to ask you why there is no luminous black color ..just as there are other luminous colors in visible and invisible colors, ..how can this effect be achieved, Thank you!
I am still not convinced that animals can see uv light. Is there something in their eye receptors that could explain it, or is it only a matter of size? edit: phone cameras are getting smaller and smaller. Will they also be able to detect uv light?
guys i have a school task. i have to innovate with a specific electromagnetic spectrum. and i chose ultraviolet. what do you guys think is possible to be made from UV?
The word"Ultra" translates to "Beyond". Ultra Violet technically means "Beyond Violet" So the light is "Beyond" the Violet slice of the spectrum. Ultra Violet, once again, technically means any light beyond violet. We are referring to light so in the electro magnetic spectrum there is only a sliver of light beyond the violet before it turns to an energy other than light. Here we go into X-rays and Gamma rays. Now if you think about it light is just what we can see, the particles called photons but X-rays and Gamma Rays are particles as well but we cant see them so they are not light. I'm being very technical here...technically by referring to any of it as light limits our understanding of the whole electromagnetic spectrum. Wow, If I had a lab I could really stun some scientists. I will wait for that day. The very concept of optics is built around the eyes of humans. They are built specifically for the visible light. It is only "Visible" to human eyes. Optics are only an extension of Humans capabilities.
Hi James, I hope this comment is still read even years after the video upload. I wonder if UV-C in general is harmful to us (our health)? There's some air purifier model that incorporates UV-C to kill germs and viruses. Is it safe to use? Any prompt advice from you, or others are appreciated. Thanks.
Hi James, could you please tell us what is the easiest way to detect the 340-400 nm range UVA light? Is there any tools from the internet that can help detect this wave of UVA? Thanks!
Yes, you can use a white piece of printer paper or a photoresistor. I wrote an article about how to make a "light detector" which also detects invisible light: aapt.scitation.org/doi/abs/10.1119/1.5145542
Look for UVC banana test videos by big Clive and others. Unfortunately, many devices with LEDs are complete fakes. The manufacturers of those are particularly despicable.
Hello. Frequently asked questions about UV radiation and UVC radiation on the skin of the human body. "sunshine" Solaris. Made in the 80s. The exposition in 2006. Is it possible that it will be a habit of heat in the face, still red eyes and redness is a consequence? I had a lamp to steal about 1m from the face for about 25 minutes. Protected eyesight only when looking at eyes and eyes. I watch and blood circulation. varnish, heat, and heat build-up are a nuisance to eating. Is it possible that this is due to UVC burns, or will it be just a match of conditions and is it a hormonal or other matter? Am I a bright type, then, when it comes to DNA that could be changed? How much must be possible? Thank you very much for your answer.
So tell me smarty pants why are we getting UVC readings at ground level now? What will the effects of the UVC light be on the algae growing in the oceans?
curious observer that's bullshit. The ozone layer is at its thinnest at the poles and the UV readings are weakest at the poles. That data debunks the ozone theory. The weakening magnetic field could be the reason for elevated UV levels. The problem is UVC causes algae to mutate. Algae is an important part of our eco system and thought to be a key component in the oceans natural balance. I find it hard to believe his UVC readings at ground level given a simple plane of silicon glass can block it, that's why I asked for him to move a piece of glass in front of his sensor.
curious observer the depleted ozone layer is being blamed for elevated UV readings even though it's been proven otherwise. I'm not sure what's so hard to understand there. The point in taking the UV-C readings behind glass is to try and weed out any foolery. It doesn't take much to block UV-C and silicon works very well. The point is if UV-C readings are more than zero at ground level then something is seriously wrong and it's not a depleted ozone layer.
I have one that I've been using for internal use.. the first one broke and was pretty bloody mess but I found one on ebay that has been working perfectly.
@@Jan-gm5cm I'm not sure what unit number means but It was one that had a shop light setup. I took the protective cage off. The bulb seems very durable.
@@Jan-gm5cm if you're going to use it internally, I recommend covering the bulb with mineral oil before inserting it. It takes some getting used to at first, but you won't feel a thing after a couple 15 minute sessions. UVC light will kill the outer layer of the colon, and as such the nerve endings will dull.
I could watch another hour of this
That was absolutely fascinating! You did a fantastic job demonstrating how the different versions of UV react to different things.
Your information was great, your demonstrations were great, and your delivery was perfectly listenable.
Thanks!
A quiet but entirely entertaining and informative video. Very well put together, imo. Thank you very much.
Well that's exactly what I was looking for! Great video! Thanks! That was very informative and interesting!
Great work! The content I'm finding keeps getting better and better.
Cool video. Simple and direct. Congrats
Fantastic video, the lecture was well done and the demos really bring it all together. Looking forward to more in the future
Great job. Very concise yet very informative.
Thanks for different engaging demonstrations
i can tell a lot of effort went into this. great job!
And the liberal ignorant, dumb-down freaks vote it down.
The polystyrene vs paper with brightener additive used to elucidate the UV lines of a mercury spectrum is especially well done.
Minor correction - there's no luminol in glowsticks. They're various phenylanthracines and rhodamines.
Your videos are great:) ...Please keep making them 👍
There are so many great little details in this video. I purchased a 365nm led to play with.
Robonza
Kay Chestang
Kay Chestang
Amazing video teacher. Outstanding.
Subbed, reminds me when school taught me to ask questions without ridicule❤️💪
Excellent job! Very engaging and informative! I just subscribed to your channel!
yeah man, awesome I felt like a child again
Thank you so much, this was very informative and well put together!!! great work I have just purchased a UV flashlight 365nm and was playing around with it to see what i can experiment with!
At 5:01 You have solved the egyptian DJED pillar conundrum. They were bouncing sunlight off mercury mirrors or had mercury bulbs. The far UV (purple) would have heated the pillar at a specific band on the column = matching the hot part on the human body...
Hey man, really love your video!
I was researching on how to do UV photography and this video helped a lot :)
I like it! Thanks for video.
Aw, that was so awesome, I was sad when I realized the video was ending. I think I will subscribe! :-)
Great presentation, as usual.
Amazing and wonderful explanation and experiments. Thanks a lot sir
This blew my mind. Thanks and subscribed.
so cool!
Fascinating
I’ve always liked this video
Best Channel Ever Keep up the Good Work...
Thank you, that was very well explained! Would you do a video on UV-C sanitizing of PPE (Covid-19)? For instance: an 11W UVC fish tank sanitizing lamp, placed "x" inches away from a mask, needs to be exposed for how many minutes? And, there is probably a need to "flip" the mask over and expose that side to UVC too, correct? For example: an aluminum lined fish tank, with masks placed in it, with about 5 inches of distance from the UVC lamp. Would take 30 minutes (15 minutes each side or is the reflectivity from the Aluminum sufficient?)? Thanks again 😊
Nice job. You should have more subs.
Dude, 5 fucking minutes of listening to you is enough! Jusus!
What the he'll is Jusus?
What a nice video! :)
Very nice video 👍
Good Day Sir!
🙏 Rohitkumar from India!
Nice informative video.
Just have a query, is the far Uv light and uv-c belongs to same class or its further sub categorised differently? suppose if we are able to produce UV-C light with a lamp, i.e. Higher frequency then will be safe for humans skin? Or it is also dangerous?.
🙏
Thank You!
informative video! :)
Which wave length is better for curing epoxy on very small areas ?
Great vid
Sam The Mule
Top stuff
Excellent video
Thank you for a good VDO
Good information
Great stuff!
Thank you, Nice article, I have thought of one use for it now, thanks. I can now see you but you can't see me!
Sir, are you familiar with the you tubevideos about restoring yellowish plastic back to white? What type uv light are they using? Thanks
So Mr. Lincoln, if you are seeing this in 2023...what would be the reason for purposely installing street lights with purple lighting around the world saying they shorted out and turned purple by the same manufacturer? Checkpoints to see what is in or on the human body for example? Hmmm?
Hello Mr. Lincoln, .. allow me to ask you why there is no luminous black color ..just as there are other luminous colors in visible and invisible colors, ..how can this effect be achieved, Thank you!
So, which light is the strongest/best for detecting automotive A/C freon with dye leaks? thanks
Doug Harlow anything in the 365nm wavelength. I have some videos on the differences.
Nice explained
Thank you
I am still not convinced that animals can see uv light. Is there something in their eye receptors that could explain it, or is it only a matter of size?
edit: phone cameras are getting smaller and smaller. Will they also be able to detect uv light?
is a 365nm led flashlight dangerous to use on skin ? Or if you use it frequently for cleaning dog stains ?
365 nm would fall in the UVA range, correct? So you're a flashlight is a black light, and would not affect skin or corneas
guys i have a school task. i have to innovate with a specific electromagnetic spectrum. and i chose ultraviolet. what do you guys think is possible to be made from UV?
Good
The word"Ultra" translates to "Beyond". Ultra Violet technically means "Beyond Violet" So the light is "Beyond" the Violet slice of the spectrum. Ultra Violet, once again, technically means any light beyond violet. We are referring to light so in the electro magnetic spectrum there is only a sliver of light beyond the violet before it turns to an energy other than light. Here we go into X-rays and Gamma rays.
Now if you think about it light is just what we can see, the particles called photons but X-rays and Gamma Rays are particles as well but we cant see them so they are not light.
I'm being very technical here...technically by referring to any of it as light limits our understanding of the whole electromagnetic spectrum.
Wow, If I had a lab I could really stun some scientists. I will wait for that day.
The very concept of optics is built around the eyes of humans. They are built specifically for the visible light. It is only "Visible" to human eyes. Optics are only an extension of Humans capabilities.
Hi James, I hope this comment is still read even years after the video upload. I wonder if UV-C in general is harmful to us (our health)? There's some air purifier model that incorporates UV-C to kill germs and viruses. Is it safe to use? Any prompt advice from you, or others are appreciated. Thanks.
If ucv does not land on the skin and is not visible to the eye, you are safe.
Hi James, could you please tell us what is the easiest way to detect the 340-400 nm range UVA light? Is there any tools from the internet that can help detect this wave of UVA? Thanks!
Yes, you can use a white piece of printer paper or a photoresistor. I wrote an article about how to make a "light detector" which also detects invisible light: aapt.scitation.org/doi/abs/10.1119/1.5145542
What type of UV light/colour good for insect breeding
very informative video
Thank you
i agree
So how does uv light kills pathogens in water. If the light is in a glass tube or LED casing. Good to know video 👍👍👍
Special Quartz Glass is transparent to UV light. Tubes that emit UVC are in the final pipes.
I own a lamp that was advertised as a UVC disinfecting lamp. Please advise me of the least expensive way to check the validity of the lamp. Thank you.
Look for UVC banana test videos by big Clive and others. Unfortunately, many devices with LEDs are complete fakes. The manufacturers of those are particularly despicable.
Hello. Frequently asked questions about UV radiation and UVC radiation on the skin of the human body. "sunshine" Solaris. Made in the 80s. The exposition in 2006. Is it possible that it will be a habit of heat in the face, still red eyes and redness is a consequence? I had a lamp to steal about 1m from the face for about 25 minutes. Protected eyesight only when looking at eyes and eyes. I watch and blood circulation. varnish, heat, and heat build-up are a nuisance to eating. Is it possible that this is due to UVC burns, or will it be just a match of conditions and is it a hormonal or other matter? Am I a bright type, then, when it comes to DNA that could be changed? How much must be possible? Thank you very much for your answer.
So tell me smarty pants why are we getting UVC readings at ground level now? What will the effects of the UVC light be on the algae growing in the oceans?
curious observer that's bullshit. The ozone layer is at its thinnest at the poles and the UV readings are weakest at the poles. That data debunks the ozone theory. The weakening magnetic field could be the reason for elevated UV levels. The problem is UVC causes algae to mutate. Algae is an important part of our eco system and thought to be a key component in the oceans natural balance. I find it hard to believe his UVC readings at ground level given a simple plane of silicon glass can block it, that's why I asked for him to move a piece of glass in front of his sensor.
curious observer the depleted ozone layer is being blamed for elevated UV readings even though it's been proven otherwise. I'm not sure what's so hard to understand there. The point in taking the UV-C readings behind glass is to try and weed out any foolery. It doesn't take much to block UV-C and silicon works very well. The point is if UV-C readings are more than zero at ground level then something is seriously wrong and it's not a depleted ozone layer.
paul austin thanks for the reply
The Sun is expanding and about to go supernova!
TYPO - - Shoter wavelengths at 6:40
That part at 5:07 is scary.. i don't know why
You look like Rob McElhenney
I JUST BOUGHT A UVC LIGHT TO SANITIZE, DESINFET, I WONDER TO KNOW HOW I CAN BE SURE IS REALLY A UVC LIGHT???🤔🤔
For disinfection need to be type C, ideally working at 257.3 nanometers.
I have one that I've been using for internal use.. the first one broke and was pretty bloody mess but I found one on ebay that has been working perfectly.
@@Jan-gm5cm it was Larson Electronics.
@@Jan-gm5cm I'm not sure what unit number means but It was one that had a shop light setup. I took the protective cage off. The bulb seems very durable.
@@Jan-gm5cm if you're going to use it internally, I recommend covering the bulb with mineral oil before inserting it. It takes some getting used to at first, but you won't feel a thing after a couple 15 minute sessions. UVC light will kill the outer layer of the colon, and as such the nerve endings will dull.
I HATE SCIENCE
Great job. Very concise yet very informative.