A metric (SI) unit of light measurement - the amount of light produced by a light source. A 65 watt household bulb typically produces around 750 lumens when new.
A lumen is equivalent to 1.46 milliwatts of radiant electromagnetic energy at a frequency of 540 terahertz.
cf. candela, foot-candle, lux.
Entry last updated 2002-04-03. Term 743 of 1487.
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