Sunday, November 06, 2005

'Factor 8' Solutions: high efficiency fluorescent lighting

The most wide-spread lamp type (incandescent) is also the most inefficient one. It is more like a heating convector that just happens to produce some light. Per watt input power, incandescent lamps produce typically about 10 lumens. Cf below graph, fluorescent lamps do a factor 8 better, while technologies exist today to achieve more than factor 10.

Going the other extreme, a candle just produces 1 lumen/watt, and is even 10 times less efficient than an incandescent lamp.

Figure: light efficiency for various technologies (source: European Ballast Group)

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