A blue street light illuminates the intersection of Shawnee St. and E. Lynch Street in Durham, N.C., Nov. 26, 2022. Ethan Hyman ehyman@newsobserver.com This series from The News & Observer’s ...

LEDs are one of the most energy-efficient lighting ... 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.

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 ...

Cities have switched from sodium lamps to LEDs due to their comparative energy efficiency ... wash most shades out and make colors appear blue, purple, or black. This means that everything ...

In defective bulbs, this layer forms cracks over time, turning the color back to blue or purple. Like most utilities, Duke Energy adopted the 4,000 Kelvin color — similar to moonlight — as the ...

While it looks just as real as red or blue, purple is actually an optical illusion crafted by your brain. Look closely at a rainbow, and you’ll spot red, orange, yellow, green, blue, and violet ...

We are so used to the oceans being blue we use it as a signifier everyone ... photosynthesis as their dominant way of capturing energy from sunlight. This oxygen accumulated in the oceans and ...