We've long known that soft candle light generally triggers a gentler mood, and grey skies can make us more gloomy. Some people tend to be depressed in the winter, when the sun sets early.

The same dynamic takes place inside our homes and offices. The artificial light that comes from the ceiling or floor lamp will have an impact on us. Especially the harsh light of fluorescent bulbs creates a cold, stark atmosphere.

Researchers at the German Fraunhofer...
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