Allochromatic light emitter

A process for use of an allochromatic light emitter, the process comprising:

• providing an emitter casing with a light exit port;
• providing a fluorescent substance formed by an LED grid, said LED grid having a plurality of LEDs divided into no less than two LED groups, with the LEDs of an LED group emitting light of a wave length differing from the wave length of the emitted light of another LED group;
• controlling the color of the light reproduced on a target plane with an electronic control providing various LED groups independently of one another with a respectively variable operating voltage with the relationships of the operating voltages of different LED groups controlled and/or regulated with respect to one another in accordance with a color to be reproduced on a target plane to irradiate building facades, or for illuminating spaces, wherein a color change is actuated for informing people present in the spaces or viewing the facade of special conditions, in particular conditions of danger, or for use in the communicative technology, with predetermined paths being indicated by actuating an associated color.