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The L Prize (aka the Bright Tomorrow Lighting Prize) is a competition run by the United States Department of Energy aimed to "spur lighting manufacturers to develop high-quality, high-efficiency solid-state lighting products to replace the common incandescent light bulb".〔(www.lightingprize.org )〕 The competition, launched in May 2008 (at Lightfair ), offers two prizes for the replacement of two types of bulb, an A19 60-watt incandescent light bulb and a PAR 38 halogen incandescent bulb. The prize fund for the 60 W replacement is up to a maximum of US$10 million and for the PAR 38 up to US$5 million.〔(LPrize-Revision1.pdf )〕 There is a third category, yet to be publicly defined, called the 21st century lamp.〔(L-Prize Requirements )〕 The competition has set out various qualifying requirements for the replacement bulbs summarized in the table below: ==Winner== It was announced on 3 August 2011, that the winner of the 60 W replacement bulb competition was a bulb made by Philips. The winning bulb was a LED lamp using less than 10 watts and emitting the equivalent amount of light as a traditional 60-watt incandescent bulb. That amounts to an 83% energy savings. It was announced that Philips would be given the US$10 million cash prize.〔〔 The bulb was released commercially in February 2012 through several online sellers. The widespread launch at retail stores, however, was not until Earth Day, April 22. Although the subsidized price was expected to be $22 in the first year, $15 in the second and $8 in the third, the bulb was initially selling for $50–$60 (without rebates) as of July 2012. As of March, 2013 Home Depot began offering the bulbs for $15 in stores.〔http://www.homedepot.com/buy/philips-10-watt-60w-led-a19-soft-white-2700k-light-bulb-e-l-prize-award-winner--423244.html〕 Many stores sold out, and according to Philips customer service the L-prize bulb has been discontinued. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「L Prize」の詳細全文を読む スポンサード リンク
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