When energy is restricted, it is no longer possible to plan light according to the principle ordinarily used: general lighting at highest possible illuminance. The more light the better it has been said. This is wrong because it does not give good lighting but costs a lot. Good lighting does not need more energy, but better planning, with respect for individual needs, and for good percep-tion of the environment. Also needed is a technique that permits adjustable light on the work place. This is fairly simple in the office but more difficult in industry. To solve this problem is more important for the lighting planner, than the calculation of illuminance values.