NPR News: Several Cities Convert To LED Street Lights In Conservation Efforts

Several Cities Convert To LED Street Lights In Conservation Efforts
Many cities are converting to LED street lights. The move can help restore darker skies and make stars visible again, and they also save energy and money. But some LEDs emit light that disrupts sleep.

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Làm đẹp Blog 247 November 22, 2016 at 04:41AM
Category Health & Science