Patent ID: 9345090
Filing Date: 2016-05-17
CPC Classification: H05B,Y02B

Claim Text:
1. Lighting system arranged to control a light intensity and a color temperature of light in a room, the lighting system comprising: a light source arranged to emit light, the light source comprising a first light emitter adjustable between a number of light intensity levels and arranged to emit light having a first color temperature, and a second light emitter adjustable between a number of light intensity levels and arranged to emit light having a second color temperature, wherein said second color temperature is different from said first color temperature, the light source is further arranged to provide an output signal comprising information pertaining to a light intensity level of said first and second light emitters, respectively; a light sensor arranged to measure the light intensity and the color temperature of the light in the room, the light in the room originating from both the light source and at least one more additional light source, and to provide a sense signal comprising information pertaining to the measured light intensity and color temperature; and a controller arranged to control the color temperature and the light intensity of the light in the room by adjusting the light intensity level of said first and second light emitters, based on said sense signal provided by the light sensor and said output signal provided by the light source; wherein the controller is further arranged to calibrate the lighting system by defining a correspondence between a number of light intensity levels of the first light emitter and a corresponding light intensity measured by the light sensor and a correspondence between a number of light intensity levels of the second light emitter and a corresponding light intensity measured by the light sensor, and to store these correspondences in a memory wherein the controller is further arranged to set a desired light intensity and color temperature of the light in the room by: from the sensor receiving measured present light intensity and color temperature of light in the room; determining a contribution of light intensity and color temperature from the at least one more additional light source by subtracting a present contribution of light intensity and color temperature of the first and second light emitters, respectively, from the measured present light intensity and color temperature; determining new contributions of light intensity and color temperature for the first and second light emitters, respectively, such that the desired light intensity and color temperature of light in the room can be achieved; determining, based on the correspondences stored in the memory, new light intensity levels of the first and second light emitters corresponding to said new contributions of light intensity and color temperature; and setting the light intensity levels of the first and second light emitters to said new light intensity levels of the first and second light emitters.