This paper describes the findings from a scale model study to investigate the distribution of daylight in rooflit models, and the effects of different spacings of the rooflights. A single-storey model was used, with a variety of removable roofs ; flat, northlight, shed, sawtooth, monitor and dome. The results were used to generate recommended spacing-to-height ratios corresponding to the uniformity guidelines in the CIBSE Code for interior lighting. Monitor rooflights gave the most even illumination. Dome-type skylights needed the closest spacings and also gave poor wall luminances. Closer rooflight spacings may also be required in spaces with low surface reflectances or large interior obstructions.
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