Electric power supply device for light emitting diodes and light projector comprising such a device

The device has circuits (B0-Bn) with transistors (2, 15), fuses (5) and Zener diodes (9) that are responsive to voltages at terminals of LEDs. The circuits are in short-circuit in a non-reversible manner when the voltages at the terminals of the LEDs exceed a preset limit. The transistor (2) is isolated by an electrical connection between a base and an emitter, when the LED is in operating state. An independent claim is also included for a lighting device e.g. headlight or traffic light, for a motor vehicle, including a LED supply device.