| 摘要 |
The luminaire has a concave reflector ( 1 ) with an optical center ( 2 ) on an optical main axis ( 3 ), in an optical main plane ( 4 ). A screen ( 6 ) extends along the main axis ( 3 ) up to a light emission window ( 5 ). The reflector ( 1 ) has a first facetted reflector portion ( 10 ) at the first side of the main plane ( 4 ), which extends through the main plane ( 4 ) and which may be curved pardboloidally, the optical center ( 2 ) being its focus and the main axis ( 3 ) being its axis. A second facetted reflector portion ( 20 ) is present at the other side of the main plane ( 4 ) and may be curved parabolically, having a secondary axis ( 22 ) passing through and a focus lying in the optical center ( 2 ). The secondary axis ( 22 ) is tilted with respect to the main axis ( 3 ) through acute angles in the main plane ( 4 ) as well as out of said plane ( 4 ). The luminaire produces a screened-off light beam which is asymmetrical in horizontal as well in vertical planes, which makes the luminaire suitable to be used for the illumination of highways in counter-traffic direction.
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