Human Centric Lighting - biologically effective light for a better quality of life. Many people suffer from a lack of natural light without really realising why. This is particularly evident for human well-being during the short dark seasons when light is scarce. The natural rhythms in the body become smoothed out due to traditional static artificial lighting, leaving people out of their natural balance. Our biorhythms (day and night activities) are positively influenced by the dynamic light colour spectrum of human-centred lighting technology.