Patent ID: 9392664
Filing Date: 2016-07-12
CPC Classification: H05B

Claim Text:
1. A method of operating an LED lighting device having at least two color channels, wherein each color channel comprises at least one LED, the LEDs of a color channel each have the same color, and each color channel is configured to be activated separately, and at least one photodetector, which is configured and arranged to detect a portion of the light radiated by the LEDs, the method comprising: switching over the LED lighting device from an operating phase into a measurement phase, wherein, in the measurement phase, the LEDs radiate sufficient light so that a current signal level of the at least one photodetector lies in a range from 75% to less than 100% of a peak current signal level of the at least one photodetector; activating temporally consecutively the color channels so that a light radiated during the measurement phase by the LEDs has an integral mixture that substantially corresponds to a color mixture of the operating phase, wherein, during the measurement phase, each color channel is activated separately by a pulse width modulation so that a ratio of pulse widths of the color channels during the measurement phase substantially corresponds to a ratio of the pulse widths of the color channels during the operating phase.