The energy consumption in non-domestic buildings and the

exploitation of daylight has been recognized as a valuable means of achieving
energy efficiency in buildings and improving visual quality of interior
building spaces. Previous studies indicated that, by employing daylighting,
reduction of 223 million tons of CO2 emissions (Burton, Doggart; 1991) (Alrubaih;
2013) or 24,000 MW of energy demand (McHugh, Pande, Ander, Melnyk; 2004) could
be achieved. However, excessive daylight exposure could cause glare,
overheating problems and thermal discomfort to building occupants. Surveys show
that, the luminous comfort of building occupants is affected by the quality of
daylighting (Crisp, Littlefair, Cooper, McKennan; 1988) (Xue, Mak, Cheung; 2014)
The benefits of daylighting can only be realized if visual needs and comfort
criteria are carefully considered in building design (Xue, Mak, Cheung; 2014). Duncan
and Hawkes (Andersen, Gagne, Kleindienst; 2013) discussed passive solar energy
design for non-domestic buildings, highlighting the importance of lighting
energy consumption in non-domestic buildings and the potential of daylight for
meeting lighting demands. The opportunities for exploiting daylight in
non-domestic buildings have been examined, as well as the factors that needed
to be considered if exploitation of daylight was to be successful (Crisp, Littlefair,
Cooper, McKennan; 1988). Methods and guidance for good daylighting design have
also been discussed, which include examples, explanations and practical exercises
of how daylight can be successfully used in a variety of building types (Duncan,
Hawkes; 1983) (Bell, Burt; 1995). Daylight in a building does lead by itself to
energy saving. Daylighting can only act as a contributor to cost and energy
savings if lighting control strategies or photo sensors can be incorporated to
dim or switch off artificial lighting when there is sufficient daylight
available. The utilization of various control strategies, such as, manual,
timed and automatic lighting controls has also been explored.