Douglas Arion, astronomer and director of the public science education organization, Mountains of Stars, talks about light pollution and the documentary 'Defending the Dark' on Jan. 13 as part of the 2023 Borrego Springs Film Festival
. One, light should be useful. There should be a reason to have it. You don’t just light something for no apparent reason.
It should be controlled; it should be on only when you need it. So, it’s perfectly reasonable to have a light by your front door so that you can find the hole to put your key in, but it should be on when you do that; you don’t need it on the rest of the night. It should be targeted, so it should only light what you need to light. If you have a pathway between buildings that people are going to be traversing, by all means, have light on it; but you don’t spread light outside of that pathway. A lot of things are grossly overlit, like gas stations. If you notice when you go to a gas station, it feels like you’re going on stage.
And, light should have as little of this blue component light as possible. When you buy a bulb with different temperature markings,. So, 2200K to 2700K is much better than 4000K or 5000K. Those commercials for BluBlocker sunglasses, or having your computer screen eliminate the blue light at night? That’s an outcome of all of this, [understanding that] having these screens on before you go to bed is a bad thing.
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