Lumen

What is Lumen?

Lumen meaning 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 source having a uniform luminous intensity of 1 candela.

 

reference: Glossary – U.S. Energy Information Administration (EIA)

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