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The latest glare metric, called daylight glare probability (DGP), has been developed specifically for daylight glare issues inside a building. Unlike other glare indices, DGP considers vertical illuminance values at the human eye when evaluating different levels of discomfort glare. One of the options to calculate DGP is to use a high dynamic range imaging (HDRI) technique and Evalglare glare analysis software. This paper briefly shows USC Watt Hall 3rd floor interior glare study results and explains the inconsistent glare evaluations from different glare indices. Then, an additional study thoroughly investigates Evalglare algorithms and HDR image capturing procedures. Pathological cases were set up inside the office on USC Watt Hall 3rd floor and tested to see if the results are as predicted by the algorithms.

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