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

NEMA’s sodium vapor high-intensity discharge (HID) lamps shipment index declined for the fourth consecutive quarter on a year-over-year basis, retreating 15.8% during Q2 2011. The index value of 77.7 ...

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 ...

YELLOW SODIUM LIGHT EFFECTIVE OUTDOORS A commercial application has been found for the extremely efficient sodium-vapor lamp. A highway in Holland is now illuminated with these light units giving ...

I detest sodium-vapor streetlights, whose yellowish glow now colors the night and stains metropolitan horizons everywhere. When I was growing up in suburban California in the 1960s and ’70s, the ...

The western side still has the sodium-vapor lamps, and Blake sees the contrast as prime evidence that the older models provide better lighting.

What color are the street lights in your town? While an unfortunate few still suffer under one of the awful colors offered by vapor discharge lamps, like the pink or orange of sodium or the ...

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 ...