Lighting apparatus 1 which takes into account the eye's ability to adjust itself, which lighting apparatus has a light source 2, an energy source 9, a device 3 which measures the lighting conditions in the area and an electronic control unit 7, 8 to control the lighting power. The control unit has a program arrangement which controls the lighting power of the light source to maintain the eye's ability to see based on both the light intensity in the area and on knowledge 10 which corresponds to the eye's ability to adjust itself and which is found in the memory of the abovementioned control unit when the lighting conditions in the area are stable or changing. <IMAGE>
