Lumen
Lumen
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Energy glossary
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Lumen
Meaning of term lumen
An empirical measure of the quantity of light. It is based upon the spectral sensitivity of the photosensors in the human eye under high (daytime) light levels. Photometrically it is the luminous flux emitted with a solid angle (1 steradian) by a point so
Source: http://www.desc.dla.mil/dcm/files/all%20inclusive%20energy%20glossary.xls
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