The interior space (2) of a headlight (3) which is sealed with respect to dirt and spray water is connected to the external air via an air inlet line (6) and an air outlet line (1). Either a suction device is provided in the air outlet line (1) or a pressure device which ensures a forced exchange of air of the interior of the headlight is provided in the air inlet line (6). The air inlet line ends in a space, preferably in an interior space of the vehicle which can be influenced by the vehicle heating, which is shielded from spray water. <IMAGE>
