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IEVref:845-01-56ID:
Language:enStatus: backup
Term: luminous efficacy of radiation
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Symbol: K
Definition: quotient of the luminous flux Φv by the corresponding radiant flux Φe

K= Φ v Φ e MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiaadUeacqGH9aqpdaWcaaqaaiabfA6agnaaBaaaleaacaqG2baabeaaaOqaaiabfA6agnaaBaaaleaacaqGLbaabeaaaaaaaa@3C6D@

unit: lm W -1

NOTE – When applied to monochromatic radiations, the maximum value of K(λ) is denoted by the symbol Km.
Km = 683 lm • W -1 for vm = 540 x 1012 Hz (λm ≈ 555 nm) for photopic vision.
Km = 1700 lm • W -1 for λm = 507 nm for scotopic vision.
For other wavelengths : K(λ) = Km V(λ) and K′(λ) = Km V′(λ).


Publication date:1987
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