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.

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 ...

CLITHERALL, MINN. - The outdoor security light in our farmyard shone all night. We couldn’t turn it off. It belonged to the power company and there was no switch. Atop a power pole, it automatically ...

Conventional mulch films are often plastic-based or made from non-renewable and toxic materials. In a recent Research article, a team from China introduced a novel biodegradable liquid mulch film ...

New chip merges quantum light factories with on-chip control, enabling real-time stabilization of photon generation across 12 sources.

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 ...