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.

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

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 ...

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 ...

Nichole 'Vapor' Ayers shared the photo of what is known as a Transient Luminous Event (TLE) seen above a thunderstorm over ...

NASA astronaut Nichole "Vapor" Ayers posted the image on social media and said, "Just. Wow. As we went over Mexico and the ...

Humidity, or the amount of water vapor in the air, directly impacts how light travels. On very humid nights, the air is full of water molecules. When the bright light from fireworks hits those ...

Air disinfection using germicidal ultraviolet light (GUV) has received increasing attention during the COVID-19 pandemic. GUV uses UVC lamps to inactivate microorganisms, but it also initiates ...

BBMP replaces sodium vapour lamps with LED lights to save energy and reduce electricity bills in Bengaluru.

Electronic ballasts usually present two stages, one for feeding the high pressure sodium (HPS) lamp and the other for power factor correction (PFC). This paper presents electronic ballasts using ac-ac ...