Abstract
This paper describes the findings from 18 months of experimental work assessing four innovative daylighting systems. Two identical south-facing mock offices were constructed. One room could be fitted with an innovative system; the other had conventional glazing. The internal distribution of daylight was measured in the rooms simultaneously, permitting direct comparison. The project was linked to the international daylight monitoring programme in which Building Research Establishment is taking part. This allowed the performance of each system to be evaluated in relation to outside illuminance levels and sky luminance distributions. Each system was assessed according to its effect on the absolute illuminance levels in the room, the distribution of illuminance levels in the room (uniformity), and the presence of glare or other visual distraction.
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