KEYWORDS: Light sources and illumination, LED lighting, Clouds, Light sources, Light emitting diodes, Lamps, Data modeling, Luminescence, Control systems, Visualization
In recent years, LED lighting became an indispensable alternative to conventional lighting systems. Sophisticated
solutions offer not only comfortable white light with a good color rendering. They also provide the possibility of
changing illuminance and color temperature. Some systems even simulate daylight over the entire day, some including
natural variations as due to clouds. Such systems are supposed to support the chronobiological needs of human and to
have a positive effect on well-being, performance, sleep-quality and health.
Lighting can also be used to support specific aims in a situation, like to improve productivity in activation or to support
recreation in relaxation. Research regarding suitable light-settings for such situations and superordinate questions like
their influence on well-being and health is still incomplete.
We investigated the subjective preferences of men and women regarding light-settings for activation and relaxation. We
supplied two rooms and four cubes with light sources that provide the possibility of tuning illuminance, color
temperature and deviation from Plackian locus. More than 80 individuals – belonging to four groups differing in gender
and age – were asked to imagine activating and recovering situations for which they should adjust suitable and pleasant
lighting by tuning the above mentioned light properties. It was shown that there are clear differences in the lighting
conditions preferred for these two situations. Also some combined gender- and age-specific differences became apparent.
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