Purkinje Phenomenon

2-1-345

The reduction in the luminosity of a red light relative to that of a blue light when the luminances are reduced in the same proportion without changing the respective spectral distributions.

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

Reference: C.I.E.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

English