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What is glare?
Glare is a visual sensation caused by excessive and uncontrolled brightness. It can be disabling or simply uncomfortable. It is subjective, and sensitivity to glare can vary widely. Older people are usually more sensitive to glare due to the aging characteristics of the eye. Disability glare is the reduction in visibility caused by intense light sources in the field of view, while discomfort glare is the sensation of annoyance or even pain induced by overly bright sources (Rea 2000). Compare the glare from the streetlight shown in Figure 6 to the glare from the luminaires shown in Figure 7. Reducing glare is an effective way to improve the lighting.
Figure 6. Example of lighting that can result in disability and discomfort glare |
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Figure 7. Example of how reduced glare improves the lighting |
Source: Lumec |
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