Science Magazine (20 January 2017)

Your self-driving car could kill radio astronomy

The main problem with LEDs is not that they are brighter; it’s that they are the wrong color. ​...[B]ecause the atmosphere preferentially scatters blue light—that’s why the sky is blue—these LEDs help create more of a light “haze” that obscures the view of telescopes. “We were surprised by the blue LED phenomenon and how fast it caught on,” says John Barentine of the International Dark-Sky Association, a campaign group in Tucson, Arizona. 

Read more: ​http://science.sciencemag.org/content/355/6322/232