AN OPTICAL ELEMENT FOR OBTAINING A SKYLIGHT APPEARANCE AND A LUMINAIRE

摘要

An optical element for use in front of a light source 102 for obtaining a skylight appearance, and a luminaire are provided. The optical element comprising a plurality of light transmitting cells in a raster structure 140, a diffuser 145 and an edge wall 130. A light source 102 emits light towards the raster structure 140. The raster structure 140 collimates a part of the light and transmits a further part of the light in a predetermined spectral range. White light 114 and colored light 112 that is transmitted by the raster structure 140 may impinge upon the side wall 130 of the optical element. One face of the side wall 130 is a region of specular reflectivity 135 and will reflect the light that impinges upon it back into the chamber 125 that is formed by the cooperation of the raster structure 140, the diffuser 145 and the edge wall 130. Light exits the optical element through the diffuser 145. A weak diffusion of the diffusing layer 145 is advantageous to obtain a light emission distribution which has a smooth transition between light 114 which directly originates from the light source 102 and the colored light 112 that is transmitted through the walls of the light transmitting cells.