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In the 1970s, Thorn Lighting introduced an energy-saving 8 ft retrofit tube in Europe. Designed to run on the existing 125 W (240 V) series ballast but with a different gas fill and operating voltage, the tube operated at only 100 W. Increased efficiency meant that the tube produced only 9% lumen reduction for a 20% power reduction. [ 7 ]
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, to produce ultraviolet and make a phosphor coating in the lamp glow.
By early 1959, the fad had spread to South Africa, Southern Rhodesia, Britain, Canada, and the United States. On March 20, 1959, students at the Durban, South Africa YMCA set a world record when 25 of them were able to squeeze at least the greater portions of their bodies into a standard upright phonebooth. The participants ranged in height ...
Thorn Lighting Ltd, a subsidiary of the Zumtobel Group, is a global supplier of both outdoor and indoor luminaires and integrated controls.. Thorn was founded when Sir Jules Thorn started The Electric Lamp Service Company Ltd, in 1928, dealing in incandescent filament lamps.
A lightbulb socket, lightbulb holder, light socket, lamp socket or lamp holder is a device which mechanically supports and provides electrical connections for a compatible electric lamp base. [1] Sockets allow lamps to be safely and conveniently replaced (re-lamping).
5. Original iPhone. eBay. Apple’s iPhone is now ubiquitous, but constant product updates make previous iterations almost obsolete. The original iPhone, which debuted in 2007, was a revolutionary ...