Abstract
There is growing interest in the use of ducted daylight systems as a means of increasing the natural lighting of buildings. Such systems are also known as 'daylight guidance', 'tubular rooflight' or 'light-pipe' systems. Four coordinated experimental campaigns have been undertaken since 2004 in order to provide coherent test data for a wide range of light-pipe systems. In total, over 650 hours of systematic monitoring of light-pipe systems and components, mainly under natural daylight conditions, and also with supplementary laboratory measurements have yielded a wealth of data on the performance of the systems. These data have allowed system losses to be quantified according to ambient lighting conditions and have also enabled a generalised design model to be developed to predict system outputs according to ambient conditions. This model now serves as the basis of design for the tested systems.
Original language | English |
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Pages (from-to) | 161-181 |
Number of pages | 21 |
Journal | Lighting Research & Technology |
Volume | 42 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Jun 2010 |