CONSISTENT COLOUR CALIBRATION IN LED-BASED LIGHTING INFRASTRUCTURE

The present invention relates to color generation in an indoor or outdoor lighting device, and more particularly to a control method which provides spatially consistent color control of a lighting device designed for use in, e.g., spatially extended premises or environments containing obstacles, and thus including multiple light sensors to allow efficient control. Color consistency is achieved by an arrangement where light of one or more of the light sources impinges on more than one light sensor. If constructional detector features, such as filter characteristics, coincide, then these sensors should in principle, after the appropriate processing, report identical color points of the light source under consideration. Indeed, color is a path-independent property of light, and this is the basis for a mutual calibration scheme of the detectors according to the invention. The calibration scheme is part of a control algorithm and is intended for use in place of a conventional control algorithm, either intermittently or permanently.