A rear light unit for a vehicle including a plurality of reflectors and bulbs assigned for forming a rear light, a brake light and a rear fog light. The invention aims to provide a rear light unit which is more compact for an identical number of signal lights. To this end the rear light is made up of a row of four reflectors and bulbs, at least two of which reflectors have bulbs with two power levels. One reflector together with a bulb switched to the higher power level forms the brake light while the other forms the rear fog light. The reflectors are arranged at a distance from each other which complies with the legally required minimum separation between the brake light and rear fog light.
