Request for brightness matching data and mathematical color vision models.

Abstract

The principles of light measurement as a true visual quantity are discussed in a recent technical report prepared by CIE (Note 1). The great achievements of the CIE in defining the photopic and scotopic standard observers were noted. Experience with these observers has shown that, while the scotopic standard luminous efficiency function (y'A) is satisfactory, the photopic function Y(A) has some drawbacks. Y(A) serves adequately enough for assessing many continuous spectral broad-band light sources, according to the equation: