Behind electrochromic glazing: Assessing user's perception of glare from the sun in a controlled environment

The adaptable transmittance of electrochromic glazing allows to control the solar radiation entering buildings, yet level needed protect from glare is still an unanswered question. To bridge this gap, study evaluates visible light (? v ) required for blue-tinted low prevent discomfort when sun through glazing. Twenty participants were exposed four visual scenarios with varying viewing directions and window transmittance. Results indicate that close central field view, a normal-hemispherical transmittance, ? v, n-h 0.6% prevents disturbing most users but does not provide comfortable situation (this condition corresponds “seen” disc’s luminance 4.8 M cd/m 2 ). achieve situations, 0.14% was found suitable. For non-critical directions, sufficient visually space participants. This also examined reliability five metrics by comparing their objective output subjective responses tested conditions. contrast-based (Daylight Glare Probability, CIE Index, Unified Daylight Index) possess valid positional sensitivity show higher Spearman’s rank correlations (? – 0.56–0.59) compared solely saturation-based as vertical illuminance (E 0.44).