luminous efficiency (of radiation) [V]

ratio of radiant flux weighted according to V(λ) to the corresponding radiant flux


where Φe,λ is the spectral radiant flux and λ is the wavelength

Unit: 1

NOTE 1 For the spectral luminous efficiency, , see "spectral luminous efficiency".

NOTE 2 For scotopic vision, the symbols in the formulae are replaced by V’, Φ’ , K’ and  respectively.

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