Lumens per watt (lpw)

A measure of the efficacy of a light source in terms of the light produced for the power consumed. For example, a 100-watt lamp producing 1750 lumens gives 17.5 lumens per watt. Examples: Edison's first lamp 1.4 lpw Incandescent lamps 10-40 lpw Fluorescent lamps 35-100 lpw Halogen lamps 20-45 lpw.

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