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luminous efficacy

noun
1.
the quotient of the luminous flux of a radiation and its corresponding radiant flux K
2.
the quotient of the luminous flux emitted by a source of radiation and the power it consumes. It is measured in lumens per watt ηv, Φv
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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