The aurora, also known as the northern lights (aurora borealis ... in a wide variety of colors — from green to pink to blue and purple — that can leave skywatchers both mesmerized and mystified.

Although blue LED lights are, in principle, deep blue in color, they do naturally have a bit of a purple and violet tint, he explains. It’s possible that the lamps themselves could be ...

This is where the mysterious purple coloring could come in. It's entirely possible that over time, this phosphor layer has peeled away from the blue light, altering the color of the street lights ...

In Vancouver, more than 100 blue or purple street lights have been reported to the city — the result of a manufacturing defect involving a coating on the light. The downtown intersection of ...

Purple and blue hues are due to a manufacturer error, Keith Richardson, a senior communications manager at Duke Energy, told The News & Observer. The defect causes the light to gradually turn ...

WARTMAN: Once we vacuum all the air out of the tube, we put the gas in - either neon gas, which lights up reddish-orange, or the blue gas, which is argon with mercury in it, which lights up blue.