Lumen (lm)

Lumen (lm)

The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total "amount" of visible light emitted by a source. Luminous flux differs from power (radiant flux) in that luminous flux measurements reflect the varying sensitivity of the human eye to different wavelengths of light, while radiant flux measurements indicate the total power of all light emitted, independent of the eye's ability to perceive it.

The lumen is defined in relation to the candela as

1 lm = 1 cd*sr

www.wikipedia.org

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10/14/1932
date of birth
Larkin, Anatoly
10/14/1946
and annually
World Standards Day

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