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Making War On Light Pollution
Hugh Pickens writes "Almost thirty years ago I worked in the Middle East helping install a nationwide communications system and had the opportunity to be part of a team doing microwave link tests across Saudi Arabia's Empty Quarter. Something I've never forgotten were the astonishing nights I spent in the desert hundreds of miles from the nearest city where the absence of light made looking at the sky on a moonless night feel like you were floating in the middle of the galaxy. In Galileo's time, nighttime skies all over the world would have merited the darkest Bortle ranking, Class 1. Today, the sky above New York City is Class 9 and American suburban skies are typically Class 5, 6, or 7. The very darkest places in the continental United States today are almost never darker than Class 2, and are increasingly threatened. Read a story from the New Yorker on what we have lost to light pollution and how some cities are adopting outdoor lighting standards to save the darkness."
I live in Salt Lake City, and the light pollution here is just like any other city. My favorite place is to visit Lake Powell, near the Arizona border where there are no city lights for at least 50-100 miles.
I always thought it would be nice if we had one day a year where people made a conscious effort to turn off all their lights, like "Star's Day" or some other stupid name so people could have one night a year to keep lights off, but that would inevitably just lead to an increase in crime for that night, so... darn.
We'll just have to enjoy it when I'm camping.
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A few years back on TX State Highway 77 heading north I could see an odd skyglow that I noticed just a few miles north of Raymondville TX. I was interested quickly because there is nothing in the ranch land between Raymondville and Corpus Christi that could be making that much light. Is I continued north, I noted the slowness of the angular change of the light and realized it had to be Corpus. A couple of hours of driving confirmed that the skyglow in this city of absurd light was really visible 120 miles south of here.
This city is totally filled with flood-lit carlots, an incredible amount of freeway lighting (way more per mile than any other Texas city that I've seen), billboard's littering the cityscape all lit from below, and a total disregard for our very unique coastal wildlife. Light pollution is just another example of our culture's unnatural incompatibility with our natural environment.
One answer is to only run 1/3 of the lights at any given time and randomly change which 1/3 is on. Tests have shown that this tends to REDUCE crime. When the lights are always on, criminals can see where the dark places are and hide there. With random lights, their nice dark hiding place can light up like a parking lot without warning. To a criminal, a light that could come on at any moment is as bad or worse than an always on light.
It's a fairly easy way to save a lot of electricity and help with light pollution. Bonus points if a "scream sensor" immediatly lights the area fully. Double bonus if the surrounding lights light up in an arrow pattern so a police helicopter can spot a problem area visually.