Abstract
The present photopic photometric system is based on the CIE photopic relative luminous efficiency function V(λ), most of whose data were obtained by the flicker photometry. In recent years, however, it is pointed out that the CIE V(λ) does not necessarily represent the spectral sensitivity for the brightness perception. In the present experiment, the relative luminous efficiency functions were determined by the heterochromatic brightness matching method with a 2° visual field at fovea at the various retinal illuminance levels of 1 troland through 1000 trolands. At illuminance levels higher than 10 trolands, all the relative luminous efficiency curves showed a broader shape than the CIE V(λ). In some observers the relative luminous efficiency curves became broader with increasing the retinal illuminance. The present experimental results sugges that the brightness perception is contributed from the opponent-color channels.
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