Discomfort Glare in Lighted Streets

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Abstract
Glare which affects comfort or causes distraction is distinguished from glare which affects the ability to see. The results of an investigation to determine the factors which cause discomfort glare in lighted streets are summarised, and the influence of these factors on problems of street lighting design is studied. Discomfort glare was found to be influenced by the general brightness of the scene, by the angle between the direction of a glare source with the line of sight, and, under street lighting conditions, by both the intensity and intrinsic brightness of the source. The glaring effects of a number of sources were found to be additive. No difference in the glaring effects of yellowish, bluish, and white light could be detected. It has been found possible to express the results in a form easily applicable to problems of street lighting design.

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