luminous flux

noun

Definition of luminous flux 

: radiant flux in the visible-wavelength range usually expressed in lumens instead of watts

First Known Use of luminous flux

1911, in the meaning defined above

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The first known use of luminous flux was in 1911

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luminous flux

noun

Medical Definition of luminous flux 

: radiant flux in the visible-wavelength range usually expressed in lumens instead of watts

called also light flux

More from Merriam-Webster on luminous flux

Britannica.com: Encyclopedia article about luminous flux

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