An illuminated information and advertising device provides continuous light gradation, in white or colored lights. The incandescent lamps are preheated in an electronically controllable manner independently of the information indication. During the course of the indication of information, the brightness of the incandescent lamp can be varied continuously with electronic means in accordance with a given program. The storage and switching elements of the illuminated board can also be controlled by means of bipolar signals and are also provided with separately controllable inputs for varying the light gradation and/or for the preheating. This controllability ensures the compatability of the electronic control circuit of the illuminated board with the electronic control circuit of the color contrast devices, which are equipped with magnetic indicating elements; thus, it is possible to operate, in conjunction with an outdoor lighted board, easily readable color contrast devices disposed indoors, by means of which complete control can be exercised.
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