Patent ID: 7549783
Filing Date: 2009-06-23
Classification: F21V,F21W,G02B

Abstract:
1. A luminaire with directional side-light extraction, comprising: a) a light pipe with a light-carrying core; the light-pipe having a first end in which light from a light source is received, a second end, and a longitudinal axis; b) light-extraction means on the surface of the core of the light pipe, along a first longitudinal side of the luminaire; the light-extraction means being confined to a radial swath of the luminaire, along the longitudinal axis of the luminaire, of substantially less than 180°; c) light-saving means on the second end for directing saved light from the second end towards the first end; d) the light-extraction means being adjustable to accommodate angular distributions of light from each one of the light sources of a metal halide lamp, an LED lamp or a halogen lamp, one at a time; and e) light-extraction efficiency of the light-extraction means of the luminaire increasing non-monotonically from the first end to the second end of the light pipe.