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Position of the glare source in the field of view (position index)
Body language can change the position index of a glare source to as little as Vie of the discomforting effect it would have if it were located on the line of sight (Handbook, Fig.
The entire room (both window and opaque surfaces) is cut into small segments of calculated luminances (in this study, 40 by 40 segments are applied on each surface which is consistent to the ray tracing grid) for detecting if each small segment is a glare source. The reason to have so many small segments is to capture the bright projection area caused by direct sunlight.
Discomfort glare depends not only on physical and photometric factors but also on temporal factors: how long and how often the glare source is in the FOV.
In random order different filters were positioned in front of the glare source, creating 9 light levels (40, 20, 10, 5.0, 2.5, 1.26, 0.63, 0.32, and 0.16 lx at the observer's eye).
Although a luminance map provides a highly detailed representation of the visual environment, there remains the challenge of determining what regions in the image constitute a glare source in order to compute glare discomfort metrics such as the DGI.
Table 3 shows that the single best predictor of participant satisfaction (relative to all questions) is typically the DGI values derived from the glare source identification threshold of 500 cd/[m.sup.2].
In addition, the uniformity f was calculated (ratio of minimum illuminance at one of the measuring points in the measuring great to the mean illuminance), possible glare sources were identified and the colour rendering index [R.sub.a] was estimated.
Brightness as a reliable and simple indicator for discomfort glare from large area glare sources. In International Commission on Illumination (CIE), The First CIE Symposium on Lighting Quality (pp.
Physiological glare, also called the disability glare, occurs when one or more glare sources occurs in the field of vision.