30 Aug '13, 6pm

Roundup: 100-Watt-Equivalent LEDs

General Electric’s entry, for example, relies on an active cooling system developed by Nuventix, in which a vibrating diaphragm blasts tiny puffs of air through the fins of a metal heat sink, significantly increasing its efficiency. Switch Bulb Co. uses liquid instead of air or metal to convey heat more rapidly from the LED junctions to the outside of its bulb. Osram Sylvania and others have chosen an A21 form factor for their bulbs (A21 is the larger size and shape commonly used for three-way incandescents),which allows significantly more area for heat sinks, even if it means the bulb won’t fit all fixtures. And Philips Lighting and Intematix Corp. (whose design is sold by Feit Electric under the Utilitech label at Lowe’s home improvement stores) have gone with “remote phosphor” designs, in which the phosphors that temper the LEDs’ harsh blue light are part of the typical...

Full article: http://spectrum.ieee.org/geek-life/tools-toys/roundup-100...

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