Daylight cumulative frequency data indicate to the lighting engineer the availability of natural illuminance across specified time periods. The age and site specific nature of previous data prompted the present development of more up-to-date datasets for London and other United Kingdom locations. Due to a lack of long-term daylight measurements, data were genemted by ceuable computational techniques. Techniques for modelling solar illuminance are reviewed, ranging from models based on measured irradiance to those based on prevailing amounts of cloud-cover and sunshine. Where even the most routine weather data are unavailable, other statistical methods for determining the frequency of illuminance are used. Synthetic illuminance datasets are presented for Bracknell, UK. Cumulative frequency analyses of these data are then used to comment on current daylight availability.
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