Traffic light luminaire with colour stabilization

摘要

A traffic light luminaire (11; 31; 51, 52), in particular a railway traffic light luminaire, with
- a plurality of solid state light sources (12a-12e; 32a-32e), comprising a plurality of types (13-15; 33-35) of solid state light sources having different colours of emitted light,
- at least one light detector (16, 17; 36-41), and
- a control device (18; 42),
is characterized in that for a mixed operation mode, the control device (18; 42) is adapted to simultaneously operate at least two of said solid state light sources (12a-12e; 32a-32e), comprising at least two of said types (13-15; 33-35), such that a mixed colour light (19; 43) is generated, wherein the control device (18; 42) is adapted to maintain a luminous intensity of the solid state light sources (12a-12e; 32a-32e) of each of said at least two types (13-15; 33-35), as determined by means of the at least one light detector (16, 17; 36-41), at a predetermined intensity level for said type. The invention presents a traffic light luminaire, based on solid state light sources, which makes a broader range of colours available and allows keeping a selected color, corresponding to a particular signal state to be indicated, and its luminous intensity in a reliable way.