A note on the equivalent luminance and spectral luminous efficiency of the human eye within the mesopic range

Abstract

Measurements of the spectral luminous efficiency of monochromatic radiation within the mesopic range have already been published. Calculations show that the measured curves can be simulated by a linear combination of the spectral luminous efficiency of monochromatic radiation for scotopic (V'(λ)) and photopic (V(λ)) vision by the equation: V _eq(λ)=a. V'(λ)+b.V(λ) where the values of a and b depend on the equivalent luminance. The difference between the simulated and measured curves of the spectral luminous efficiency of monochromatic radiation are discussed. The values of the maximum spectral luminous efficacy K _meq within the mesopic range have been calculated. A set-up for the measurement of the equivalent luminance by physical photometry is described.

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