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spectral luminous efficiency

a measure of the efficiency of radiation of a given wavelength in producing a visual sensation. It is equal to the ratio of the radiant flux at a standard wavelength to that at the given wavelength when the standard wavelength is chosen so that the maximum value of this ratio is unity ((for photopic vision)) V(λ), ((for scotopic vision)) V′(λ)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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