Manufacturers originally designed double-ended high-pressure sodium light bulbs so they would be compatible with double-ended metal halide fixtures. Traditional single-ended high-pressure sodium bulbs ...
FLAGSTAFF — Since the passage in the 1980s of Flagstaff's comprehensive lighting ordinance, the golden hues of low-pressure sodium lights have come to prevail in Flagstaff skies. They are a response ...
Researchers will begin testing special lighting this summer that could illuminate beachside parking lots, boardwalks and parks without luring sea turtle hatchlings to their deaths. Bright lights on ...
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