Lumens Per Watt (LPW)
Definition: The ratio of light energy output (Lumens) to electrical energy input (Watts).
Related Links
Here are some lumen per watt (LPW) targets for common LEDs
Luminous efficacy – Wikipedia
Philips Lighting – EcoVantage
Philips’ 200 lumens-per-watt prototype LED lamp is the world’s most efficient – ExtremeTech
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