Abstract: Mirror lighting unit. To satisfy special demands on the light density distribution, such as are required, for example, by video workstations, use is made of mirror lighting units, which, in addition to longitudinal mirrors provided on both sides of a lamp, have louvre vanes of double-parabola-shaped cross-section arranged transverse to the extent of the lamp on the side where the light is emitted, and which are aligned relative to the lamp with the base side of their cross-section. In order to keep as low as possible the emission losses occasioned by such louvre vanes, the louvre vanes are provided on their base side with reflecting covers, which can, however, cause the image of the lamp which they reflect to emerge via further reflections on the longitudinal mirrors at an angle of emission which destroys the screening effect required of such lighting units.