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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 ...

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 ...

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, ...