Note 1 to entry: The photometric condition should be specified (e.g. photopic, scotopic, mesopic). If it is not specified, photopic vision is assumed and the symbol V is used. For other photometric conditions, the respective symbol for identification shall be used.
Note 2 to entry: Luminous efficiency for photopic vision is expressed by
V=∞∫0Φe,λ(λ)V(λ)dλ∞∫0Φe,λ(λ)dλ=KKm
where Φe,λ is spectral radiant flux, V(λ) is spectral luminous efficiency, λ is wavelength, K is luminous efficacy of radiation, and Km is maximum luminous efficacy.
Note 3 to entry: The luminous efficiency has unit one.
Note 4 to entry: This entry was numbered 845-01-57 in IEC 60050-845:1987.
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