a b s t r a c t
Lighting is one of the largest energy users in artificially lit buildings. In this context, daylighting strategies
that potentially reduce the needs of artificial lighting have been highlighted. However, they have not
always materialized in practice, which is mainly due to the lack of understanding of occupant perception
and behaviour of natural and artificial lighting systems. This study reports survey results from a monitoring
campaign of four offices in Korea, which was conducted from February to June 2010 with an aim
to reveal occupancy patterns, occupant use of lighting systems, and resulting lighting energy use. The
results indicate that there are no statistically significant relationships between external illuminance and
lighting use patterns, but there is a clear time of day effects (i.e. a strong tendency of turning on lighting
on worker’s first arrival in the morning). It has been found that the application of automatic dimming
control for lighting with a design illuminance of 500 lx demands to the field studied offices can reduce
lighting energy consumption by up to 43%. The study also shows that a change in occupancy patterns
observed in this study leads to an increase in lighting energy use by up to 50%.
a b s t r a c tLighting is one of the largest energy users in artificially lit buildings. In this context, daylighting strategiesthat potentially reduce the needs of artificial lighting have been highlighted. However, they have notalways materialized in practice, which is mainly due to the lack of understanding of occupant perceptionand behaviour of natural and artificial lighting systems. This study reports survey results from a monitoringcampaign of four offices in Korea, which was conducted from February to June 2010 with an aimto reveal occupancy patterns, occupant use of lighting systems, and resulting lighting energy use. Theresults indicate that there are no statistically significant relationships between external illuminance andlighting use patterns, but there is a clear time of day effects (i.e. a strong tendency of turning on lightingon worker’s first arrival in the morning). It has been found that the application of automatic dimmingcontrol for lighting with a design illuminance of 500 lx demands to the field studied offices can reducelighting energy consumption by up to 43%. The study also shows that a change in occupancy patternsobserved in this study leads to an increase in lighting energy use by up to 50%.
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