Abstract
This paper presents a revised method for choosing roller shade properties that can significantly reduce the risk of glare when closed. State-of-the-art daylight modeling is employed to compute direct and diffuse light transmission through shading fabrics using BSDF datasets with the 5 Phase Method plus a peak extraction algorithm for the specular component. The analysis is parameterized by properties listed by manufacturers: openness factor, visible transmittance, and visible reflectance. In this way, we provide recommendations for the upper bounds of properties based on annual discomfort frequency (annual time percentage when daylight Glare Probability <5.5%). We discuss the impact of Radiance-aBSDF and related uncertainties, and the comparison with glare control classes proposed in Standard EN 14501.
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