Light Pollution: John Garrett at TEDxTemecula
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- čas přidán 17. 11. 2012
- John Garrett uses his skills as a graphic artist and photographer and his wry sense of humor to teach local schoolchildren and community groups about astronomy. As vice president of the Temecula Valley Astronomers, he gives presentations in Temecula, Murrieta, Wildomar, and Menifee. His topics range from atmospheric optics to light pollution, climate, common observing, archeoastronomy, and exoplanets. A regular presenter at the Julian Starfest, John appreciates the Temecula Valley's proximity to the Palomar Observatory and works with the International Dark-Sky Association to help keep our traditionally rural skies dark enough for star gazing.
If you can have the nighttime lighting you need for safety and security, and can still see the stars, would you take both? We can have a dark sky and a well lit ground by fixing design flaws that make many lights a nuisance, a glare hazard, and a waste of energy.
In the spirit of ideas worth spreading, TEDx is a program of local, self-organized events that bring people together to share a TED-like experience. At a TEDx event, TEDTalks video and live speakers combine to spark deep discussion and connection in a small group. These local, self-organized events are branded TEDx, where x = independently organized TED event. The TED Conference provides general guidance for the TEDx program, but individual TEDx events are self-organized.* (*Subject to certain rules and regulations) - Věda a technologie
Well done John! Thank you for sounding the wake up call for activism: "go to planning department meetings and city council. We want more efficient lighting, better design, remove glare, and in doing that we'll have less light pollution and a more beautiful night sky."
WarmLight LED's below 2700k would be better with bettewr shielding, dimming and no light tresspass across the world . Asia needs Warmlight LEd's like the western countries.
I feel like I need to clarify the issue of light pollution for anyone who might watch this video. First of all, light is important for safety and security at night, and if someone talks about reducing light pollution, they are NOT suggesting that we go without light at night. That's a common misconception about dark sky advocates. What they want (mainly) is for light fixtures to be properly shielded so that their light only shines down at the ground. This modification has many benefits:
- Because the light of properly-shielded fixtures is focused on the ground instead of shining everywhere, dimmer bulbs that use less energy can be used, which saves money on electricity.
- The light doesn't go to waste shining up, where it bounces off the atmosphere, making the night sky brighter than stars, nebulae, and galaxies. That's why urban night skies are largely devoid of any trace of the cosmos, and it has a name: "sky glow".
- The light doesn't travel directly from the light source (usually a bulb) to your eyes, but instead bounces off of things underneath the light fixture into your eyes. Indirect, reflected light makes up most of what we see, so there's just no reason why we should be able to see the light source in addition to what it's illuminating. Not only do bare light sources leave spots in your field of vision, but they force your eyes to adjust to them instead of to the much dimmer light of nearby shadowy areas and of stars, nebulae, and galaxies. Sideways light from bare light sources is called "glare", and it's also responsible for "light trespass", which is light shining where it's not welcome, like a dark bedroom for example.
- Light isn't allowed to shine hundreds of miles outward from cities, where it can spoil previously untouched dark skies in the wilderness as cities grow and multiply. This one is crucial, because if you think the wilderness will forever be a safe haven for stargazers, even without us doing anything to reduce light pollution in cities, you're wrong.
There are some other things that can be done to reduce light pollution. The speaker in the video already mentioned turning off interior lights when you don't need them and using motion sensors, but there are more. Timers can be used, lights can be removed where they're unnecessary or excessive, businesses can shut off their lights when they close for the night (particularly signs and empty parking lots), interior light can be bottled in with closed curtains/shades/blinds, lone streetlights can be set up to dim/shut off in the absence of people and brighten/turn on in their presence, etc.
- Jake Self
It saddens me how this video only got a couple of thousand views while there are other videos out there which make no good nor teach anything worthy with millions of views. I personally think that this light pollution issue is more than to help astronomy, save money via energy efficiency, or even the health related issues it has with the disruption of the circadian rythm. I think that if we were able to look up and be amaze with what we see we will be able to minimize our egos and understand there
is a whole universe out there and we are nothing more than a moth of dust. Maybe then we will realize how amazing is the fact we are even alive and stop killing us each other and thrive together as a single species
i have learned that most people really do not care about the environment. I took a few years off from working in photojournalism to teach and learned that only when I told students how something in the environment would affect them personally did they become interested. No one wanted to get cancer from eating fish from polluted oceans but there wasn't a lot of concern for the long range effect.
It seems there are more Flat Earthers than Dark Sky activists, it is truly sad.
Thank you!
1 ultra bright city light disliked
basic , the astronomers around the planet really need someone or many to design or consider numerous ways of dimming city(beyond the public =dim city lights info) including building lights , have a idea of a heat resistant cover to blanket the light from upward motion buffering the lights from night sky. the glare interferes with skyviewing , 2029 /2030 interesting to .
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