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Ceravision is a privately owned lighting company based in Bletchley Park, UK. Ceravision is the inventor of a range of electrodeless lamps and integrated luminaires under the trade name ''Alvara'', the world's first High Efficiency Plasma (HEP) lamp.〔("Switched on to a bulb that lasts" ), ''The Sunday Times''〕〔("Everlasting Light" ), ''The Economist''〕 The Alvara range uses half the power and has half the total cost of ownership of competing ceramic metal halide lamps. Thus far, the lamp is not produced in styles suitable for the home and small business markets, but is marketed as bay lighting for large warehouse spaces, and as street lighting. ==Electrodeless lamp== Electrodeless lamps have been recognized, since Nikola Tesla filed a patent in 1894, as having a number of advantages: * No electrodes to break - so potentially very long life * No chemical degradation of the electrodes - so much lower lumen loss and discoloration during life * No reactive metal inside the bulb - so the ability to use much more efficient fill materials The main problems have been constraining the radio waves within the lamp, and generating RF power at low cost. 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「Ceravision」の詳細全文を読む スポンサード リンク
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