n (1925) The total visible energy emitted by a source per unit time. The SI unit is the lumen (lm), defined as the luminous flux emitted in a solid angle of one steradian (sr, the solid central angle that cuts out of a spherical surface a square whose side is equal to the radius) by a point source having a uniform intensity of one candela. Therefore, 1 lm = 1 cd sr. See Flux, Luminous.
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Gooch, J.W. (2011). Luminous Flux. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_7070
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