Optimisation and design of ducted daylight systems

Adam Robertson, RC Hedges, NM Rideout

Research output: Contribution to journalArticle

14 Citations (Scopus)


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 languageEnglish
Pages (from-to)161-181
Number of pages21
JournalLighting Research & Technology
Issue number2
Publication statusPublished - 1 Jun 2010


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