Determination of discomfort glare criteria for daylit space in Indonesia

Assessment was conducted in the reading hall of the Main Library Building of Institut Teknologi Bandung. Post-occupancy evaluation was conducted with 99 participants. None of the proposed metrics have a high correlation with the mean subjective score; the largest squared correlation coefficients are given by Evalglare-defined mean source luminance (Ls,Evalglare) and daylight glare probability (DGP). The most significant differences between mean values under comfort and discomfort scenes are also given by those two metrics. The following values are suggested as borders between imperceptible and perceptible glare perception: Ls,Evalglare = 1331-1347 cd/m2, DGP = 0.21; between perceptible and disturbing: Ls,Evalglare = 1867-1874 cd/m2, DGP = 0.22; and between disturbing and intolerable: Ls,Evalglare = 2760-3121 cd/m2, DGP = 0.24-0.26.