When sodium vapor street lamps were replaced by LEDs, soft yellow light was replaced by crisp white. But the change to purple ...

The bland orange-yellow of sodium-vapor lamps now lights hundreds of miles of U. S. highway. Until recently it has been a ticklish and costly job to get the sodium into the highly evacuated lamps ...

NEMA’s sodium vapor high-intensity discharge ... NEMA’s sodium vapor high-intensity discharge (HID) lamps shipment index declined for the fourth consecutive quarter on a year-over-year basis, ...

The key to making a long-lasting lamp was devising a way to heat the filament to a very high temperature without […] Skip to content. All Sections. Subscribe Now. 70°F.

LED makers tout the limited range of lights coming out of the modern streetlights, with a 180-degree field to the street, rather than the 360 degrees emitted from the rounder sodium-vapor globes.

Elementary school students who spent two years working under high-pressure sodium vapor lamps had poorer records of achievement and attendance, plus far slower rates of growth and development ...

Coimbatore: The city corporation replaced 9,973 sodium-vapor lamps with energy-efficient LED lamps in one-and-a-half month, commissioner J Sravan Kumar said here on Wednesday. The civic body is ...

Elementary school students who spent two years working under high-pressure sodium vapor lamps had poorer records of achievement and attendance, plus far slower rates of growth and development ...