OPTICAL SYSTEM FOR USE IN A TRAFFIC LIGHT LUMINAIRE

摘要

An optical system for use in a traffic light luminaire, comprising at least two solid state light sources for generating light and a light distribution device for distributing light incident onto the light distribution device with a specified angular luminous intensity distribution. The optical system comprises a light homogenising device including an optical waveguide for interreflecting light inside the optical waveguide, wherein the light enters the optical waveguide through an input area and exits the optical waveguide through an output area. The light generated by the at least two solid state light sources is incident onto the input area of the optical waveguide and the light exiting the light homogenising device is incident onto the light distribution device. The optical system emits a light distribution which is nearly independent of the number and the optical properties of the light sources used.