An Investigation of a Modified Formula of Daylight Glare and Limiting Daylight Glare Indices in the Thai Elderly

Abstract

Discomfort glare is perceived differently by the young and the elderly. However, the existing daylight glare formulae do not take the effects of age into account and the current limiting glare index was obtained from non-elderly subjects. To create lighting suitable for the Thai elderly, especially in terms of glare, two objectives were addressed. The first explored a modified formula of daylight glare for the Thai elderly, while the second investigated the limiting daylight glare index for the Thai elderly in particular areas of residential and public buildings. Both laboratory and field studies were undertaken. The former investigated a daylight glare formula modified for the effect of age of the Thai elderly. Experiments were carried out in a controlled chamber at Kasetsart University, Bangkok, Thailand. The latter explored the limiting daylight glare index for particular areas of residential and public buildings for the Thai elderly with studies conducted in the real environment.  A modified formula was proposed to predict daylight glare for the Thai elderly. Limiting daylight glare indices for particular areas of both residential and public buildings for the Thai elderly were also proposed, and the recorded values were found to be higher than the existing limiting daylight glare indices.