Luminaire having an around a point symmetrical light emitting surface, in particular of round shape

摘要

The light has a non-triangular or rectangular housing and light output surface, at least one hollow light conductor with a hollow volume and a reflective wall bounding the hollow volume at a distance from coupler elements decreasing from a light incident point. Refractive structures prevent light output coupling above a threshold angle to a normal to the light output surface. The light has a non-triangular or rectangular housing and light output surface, at least one hollow light conductor with a hollow volume (90) into which light from at least one source (98) is radiated and a coupler (18,20) of transparent material with one or more boundary surfaces between two media with different refractive indices and a refractive structure. A reflective wall bounding the hollow volume is at a distance from the coupler elements decreasing from a light incident point, whereby the refractive structures prevent light output coupling above a threshold angle to a normal to the light output surface.