Patent ID: 6897459

Claim:
A motor vehicle light unit comprising: a reflector defining two focal regions, one focal region being an internal focal region and the other being an external focal region, the reflector having a defined surface of an approximate ellipsoid; a light source located in said internal focal region in such a way as to produce a pool of reflected light in said external focal region; and a lens in front of said external focal region for converting said pool of light into a beam and for projecting said beam forward from the light unit, wherein the light unit further includes a filter movably positioned between the reflector and the lens, so that said filter is located downstream of the external focal region, the filter being opaque to visible light and transparent to only infrared light, and filter-carrying means mounting said filter for moving the filter between a first position out of the path of the light passing from the reflector to the lens, and a second position in which the filter intercepts a substantial part of said light passing from the reflector to the lens.