Illuminance Uniformity Filter for Theatrical Lighting Fixture

Evaluating discomfort glare from non-uniform electric light sources

“…of Equation ( 10) was used for UGR. Only Equation (2) was clearly defined as glare sensation, 8,[11][12][13][14][15][16] other formula terms used above for quantifying glare sensation were assumed in this study as an intermediate step to calculate the glare ratings. This assumption does not affect the final results of the calculation, because E d and E i in those terms are constants at each trial.…”

“…[2][3][4][5][6][7] Unfortunately, the physiological and psychophysical mechanisms of discomfort glare are not yet well understood. 8 As a result, different glare indices have been individually developed in four fields to evaluate interior electric lighting, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] daylighting (windows), [28][29][30][31][32][33][34][35][36][37] exterior area lighting, [38][39][40] and roadway and traffic lighting. [41][42][43][44][45] In particular, for evaluating interior electric lighting, Guth 9 developed an index called visual comfort probability (VCP), based on the borderline between comfort and discomfort brightness (BCD), 10 (Equation ( 1)).…”

Industry-Experienced Graduate Student Program: Innovative Collaboration in Architectural Engineering at the University of Nebraska, Lincoln

“…This finding was an interesting one, because the International Commission on Illumination recently published an extension to the discomfort glare metric that suggested that nonuniform sources should actually cause more discomfort than uniform ones. Currently, there are four publications from this work (Eble-Hankins and Waters 2004, 2009a, 2009b, 2009c.…”