Patent ID: 7874704
Filing Date: 2011-01-25
Classification: F21V,F21Y,G02B,H01L

Abstract:
1. A collimating luminaire comprising: a light-source with a diffuse reflectivity exceeding one half, said collimating luminaire intercepting the emitted light of said source, said luminaire producing a substantially uniform beamwidth across its exit aperture, and a system of specular retroreflectors comprising at least one concave retroreflector that returns part of said emitted light to said source, said retroreflectors allowing the removal of the outer part of said exit aperture, so that said exit aperture is smaller than the étendue-limited aperture for said beamwidth, wherein part of said emitted light that is returned to said source by said system of retroreflectors is then returned towards said exit aperture by said diffuse reflectivity of said source.