Glare

Glare occurs when a part of the interior is significantly lighter than the room’s luminosity in general. In this position the eyes are exposed to a stronger light than what they are normally adapted to. The most common causes of glare are that the luminaires and window are seen directly or via reflections within the normal field of vision.

Vision impairment glare

Glare occurs when a part of the interior is significantly lighter than the room’s luminosity in general. In this position the eyes are exposed to a stronger light than what they are normally adapted to. The most common causes of glare are that the luminaires and window are seen directly or via reflections within the normal field of vision.

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Discomfort glare from electric light

Discomfort glare arises from light sources or luminaires that have a higher luminance than the eyes can adapt to. The glare can occur immediately, but it can also become apparent only after a longer period.

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Discomfort glare from windows

Discomfort glare arises when a person looks out of a window in the direction of the sun or when direct sunlight falls against surfaces within the normal field of vision. In these situations, there is also discomfort in the form of increased heat radiation. Sun screening in some form is thus necessary in most buildings.

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Calculation of glare number

The degree of discomfort glare for indoor installations can be estimated by making a glare number calculation according to the UGR method.

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