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

NEMA’s indexes for high intensity discharge (HID) lamp shipments declined for the second consecutive quarter in Q3 2012. Sodium vapor lamp shipments decreased 14.8% year-over-year during the quarter, ...

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 ...

If you think your neighborhood is looking better in the dark, and you can’t put your finger on why, it might be the new street lights. All over Chicago, crews are replacing old-fashioned sodium vapor ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. As knowledge of materials and ...

COIMBATORE: The city corporation will replace 58,000 sodium-vapor street lights in old corporation areas with energy-efficient LED lamps before October. The civic body had been receiving several ...

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 world ...