When sodium vapor street lamps were replaced by LEDs, soft yellow light was replaced by crisp white. But the change to purple was never supposed to happen.

Charleston residents are admittedly proud of their city, and want it to look as nice as possible. They also would like it to be more visible, not only for the ...

In this paper, a low-cost electronic ballast for high-pressure sodium vapor lamps is presented. The proposed ballast is a two-stage circuit that requires only o ...

Researchers find a “cool” way to mitigate background water signals and demonstrate non-invasive blood ion monitoring in living mice ...

The reflection of pink neon off the crimson silk of a lawman's tie as he stands in wait under the Biograph marquee; a patch of sodium-vapor orange city sky above a bridge as magnetic and floating ...