luminous-flux

luminous flux

noun Optics.
the rate of transmission of luminous energy: expressed in lumens.

Origin:
1925–30

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World English Dictionary
luminous flux
 
n
Φv a measure of the rate of flow of luminous energy, evaluated according to its ability to produce a visual sensation. For a monochromatic light it is the radiant flux multiplied by the spectral luminous efficiency of the light. It is measured in lumens

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American Heritage
Science Dictionary
luminous flux   (l'mə-nəs)  Pronunciation Key 
A measure of the radiant power of light emitted from a source without regard for the direction in which it is emitted. It is measured in lumens. See also luminous intensity.
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