Patent ID: 9185765
Filing Date: 2015-11-10
Classification: B64D,H05B

Abstract:
1. An arrangement having at least one metameric illuminating device which comprises at least a first, second, third and fourth LED and an internal controller for changing the colour rendering index of a light produced by additive colour mixing of the first, second, third and fourth LED with the aid of a prescribed colour, having an external controller for setting a parameter (K) influencing the colour rendering index, and having a data transmitting device for transmitting the parameter (K) to the internal controller of the at least one metameric illuminating device, the internal controller comprising a program for carrying out a method for changing the colour rendering index with the following steps: determining a colour locus corresponding to the prescribed colour in the RGB colour triangle; calculating first intensity ratios I selecting an R/G/B/W colour sub-triangle which is contained in the RGB colour triangle and contains the colour locus and of which one corner is formed by the colour locus of the fourth LED and whose two other corners are formed by two of the three colour loci of the RGB colour triangle; calculating second intensity ratios I calculating third intensity ratios I K being the parameter with 0≦K≦1; and calculating pulse width modulation values (PWM) corresponding to the third intensity ratios I