Abstract
A formulation for the practical pre-determination of direct discomfort glare is proposed on the Harrison-Meaker pattern, but based on later laboratory research. A summation theorem is postulated, which states that a glare rating must be proportional to source area if simple additivity is desired. A location coefficient chart has been derived from Luckiesh-Guth's position indices, and αΛ-charts are given which allow for orientation as well as position of glare sources. An analytical expression for the location coefficient dispenses entirely with charts.
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