In some applications, the percentage of total energy consumption attributable to lighting is particularly high. In office buildings, it is around 50 percent, in hospitals 20 percent. Here, massive savings potential can be tapped by energy-conscious lighting. At a workplace, high quality of light has a positive effect on performance and wellbeing, while at the same time absenteeism declines. This has been confirmed by a number of studies (e.g. Mills/Tomkins/Schlangen, Journal of Circadian Rhythms, 2007).