Light performs two functions for human beings. As well as enabling them to see, it has non-visual effects too. Daylight produces this biological effect but it can also be achieved by means of special artificial lighting. However, though artificial lighting can resemble daylight, it cannot replace daylight completely. Artificial, biologically effective lighting is always used with the aim of creating a non-visual biological effect in humans.
However, in the view of KAN any standardization on „requirements or guidelines for the design and operation of artifical, biologically effective lighting at workplaces“ is currently neither useful nor permissible because the knowledge available on artificial, biologically effective lighting has not been sufficiently validated to allow design requirements to be specified; disturbances to humans‘ circadian rhythm caused by artifical, biologically effective lighting must be prevented; the main Impact of articial, biologically effective lighting is on the health and safety of workers at work.