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Abstract
Forty paid observers made adjustments to the borderline between comfort and discomfort (BCD). A random half of the observers adjusted a glare source with a maximum luminance of 300,000 fL, the other half a glare source with a maximum luminance of 30,000 fL. The mean BCD in the first case was 26,900 fL, in the other it was 3,860 fL. Thus, with a glare source luminance ratio of 10:1, the BCD ratio was 7:1. This range effect is consistent with various sensory range effects found in other areas, in particular, in studies where observers selected “acceptable” noise levels. The result is also predicted by Adaptation Level Theory.