Report BR 21 Availability of daylight
Publication Year
1979
Document Status
Current
Abstract
Illuminance records from Kew and Bracknell for the 10-year period 1964-73 have been analysed to produce accurate and up-to-date figures of daylight availability. Graphs and tables are provided of the percentages of various working years, months and hours for which given illuminances occur and are exceeded. Information is supplied for both horizontal diffuse and horizontal total illuminances. Limited information on the occurrence of total illuminance at five other locations in the UK is also given. The information is intended to help designers to estimate more accurately than previously possible the necessary and likely hours of use of artificial lighting in buildings. The data also provide an improved basis for calculating possible energy savings from the photoelectric control of artificial lighting installations.
Author
Hunt, D. R. G.
Publisher Information
BRE
BRE is a building science centre that generates new knowledge through research. This is used to create products, tools and standards that drive positive change across the built environment. BRE helps its government and private sector clients meet the significant environmental, social and economic challenges they face in delivering homes, buildings and communities. BRE is owned by the BRE Trust, a registered charity. The Trust uses the profits made by the BRE companies to fund research and education that advances knowledge of the built environment.
IHS BRE Press
The Capitol Building
Bracknell
BRE
UK
