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 ...

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 ...

Robert Holley, Susan Blake and Rene Oppeneiger, discuss the street lights at Southwest 112th Avenue and 165th Terrace in South Miami-Dade, June 20, 2019. They are opposed to the new LED lights ...

For almost two generations of Chicagoans, orange has been the color of night. High pressure sodium vapor lights, which create a glow reminiscent of a tire fire, have lit Chicago since the 1970s. They ...

Two much-publicized electrical companies—General Electric and Westinghouse—supply most of the U. S. with lamp bulbs. In Europe that function is performed chiefly by potent Philips Glow-lampworks of ...

Almost four decades after the orange glow first took over Chicago’s night skies, the city’s Transportation Department is taking steps toward converting streetlights back to a more natural — and less ...

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 off an intense yellow glow; and this light, ...

I’ve noticed when the city repairs broken streetlights that sometimes they install a new LED light and sometimes they do not. I would think they want to convert all the streetlights to LED lights when ...