Glare

According to BRE’s The essential guide to retail lighting: Glare is; ‘Discomfort experienced when lighting is excessively bright when viewed against the surroundings. Often the result of inadequately shielded lamps.'

The CIBSE SLL Code for Lighting (2012) defines glare as '...the condition of vision in which there is discomfort or a reduction in the ability to see details or objects, caused by an unsuitable distribution or range of luminance, or to extreme contrasts.'

The Illustrated Guide to Electrical Building Services, Third Edition (BG 31/2017), by David Bleicher & Peter Tse, published by BSRIA in 2014, states: ‘Glare is caused by extreme contrasts in luminance – for example extremely bright objects in the same vicinity as extremely dark objects. The problem of glare can take two basic forms: discomfort glare and disability glare.'

'Discomfort glare is likely to occur whenever one area of an internal space is significantly brighter than the surrounding area. Two common causes are excessive daylight entering windows and inappropriate or poorly positioned luminaires.'

'Disability glare can make work tasks difficult, and may occur when a source of bright light exists close to the line of sight. Light sources such as fluorescent lamps have very bright surfaces, however most luminaires are designed so that the lamp is rarely in the field of vision.’

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