# 17-22-036

Purkinje phenomenon

reduction in the brightness of a predominantly long-wavelength colour stimulus relative to that of a predominantly short-wavelength colour stimulus, when the luminances are reduced in the same proportion from photopic to mesopic or scotopic levels, without changing the respective relative spectral distributions of the stimuli involved

Note 1 to entry: In passing from photopic vision to mesopic vision or scotopic vision, the spectral luminous efficiencies change, the wavelength of maximum efficiency being displaced towards the shorter wavelengths.

Note 2 to entry: This entry was numbered 845-02-14 in IEC 60050-845:1987.

Note 3 to entry: This entry was numbered 17-1003 in CIE S 017:2011.

Publication date: 2020-12