The lighting parameters with which goodlighting for work can be described need to be revised to also take into account the non-visual biological effects of lighting. A new parameter that has to be added to the conventional, visual performance related ones, includes, in particular: "the right combination of lighting level and colour temperature at the right moments and with the right duration to stimulate the natural activation and relaxation of workers". Here the lighting level should be so determined that the right illuminance is obtained on the eye, this in contrast to the conventional task illuminance (often in the horizontal plane). A practical answer in the form of "dynamic lighting according to the human rhythm" is proposed. It is intended to give the same natural effects as was once provided by daylight when workers spent most of their working time outdoors
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