Glare has always been a relevant topic, especially since electric light levels began to increase. With high intensity light sources like LEDs, the problem culminated in the last few years. CIE addresses this topic in its recent publication CIE 205:2013: "Review of Lighting Quality Measures for Interior Lighting with LED Lighting Systems". Furthermore the Joint Technical Committee JTC 7 is still working on this topic. A short overview on the topic and CIE's activities is presented.
Excessive light intensity, regardless of the source type, can have several unwanted effects on people. The presence of bright sources in the periphery of the field of view may cause a reduction in visibility or cause feelings of discomfort. The discomfort might be associated with the bright peripheral light sources detracting the eye from the intended gaze direction, although the exact mechanism causing this discomfort is not fully understood. Another effect occurs when the field of view itself is experienced as too bright or dazzling, typically in daylight conditions that require sunglasses.
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