Towards an Integrated Framework for Predicting Visual Comfort Conditions from Luminance-based Metrics in Perimeter Daylit Spaces

The authors test 168 luminance-calibrated high dynamic range photographs with associated subjective user data against a set of plausible visual comfort metrics and identify metric thresholds at which discomfort can be consistently identified with minimal false-positives. Correlations were identified with vertical eye illuminance, DGI, DGP 5 ∗ Ltask, max. window luminance and max. workplane luminance. These five metrics in combination, tested against a separate evaluation dataset consisting of 584 measurements, identify 65.2% of discomfort during periods where direct sunlight may enter the test room. The discussion identifies necessary aspects of future work in varied space types and consideration of the view of occupants.

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