Abstract
The limitations of predicted glare sensation vote (PGSV), which evaluates glare from windows, are examined. The following two questions were addressed: first, whether PGSV involves the same contradiction as daylight glare index; second, how great is the effect of the source shape on discomfort glare. When the size of the source increases and coincides with the whole visual field, the value of PGSV becomes independent of the background. However, FGSV shows that the effect of source size increases with increasing background luminance. Consequently a hypothesis on the transition from the 'contrast effect' to the 'grand total effect' is shown schematically. In a subjective experiment and numerical simulation it was found that he effects of the shape of the window on glare sensation are not significant.
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