Subjective experience of discomfort glare in a daylit computerized office in Istanbul and its mathematical prediction with the $DGI_N$ method

Abstract

The $DGI_N$ (New Daylight Glare Index) method was recently developed at University of Helsinki to respond the challenge of predicting discomfort glare from daylight mathematically. For daylit offices, the presence of windows with computer workstations introduces potential glare sources. This paper outlines a survey conducted in a daylit-computerized office to identify factors contributing to discomfort glare experience and test applicability of the new method. Results suggest that light distribution and presence of reflections correlate strongly with the discomfort experience, and the $DGI_N$ could be sufficiently predictive to serve as an aid to design because it shows reasonable correlation with the subjectively perceived discomfort.