A method for calibrating a color space transformation according comprises driving of a light source at a first ambient temperature T1. The light source it is tuned to emit light with a number N of combinations of at least two correlated color temperatures and at least two intensities. Furthermore, the method includes receiving first red coordinates, first green coordinates and first blue coordinates measurements in the RGB color space. First x-coordinates, first y-coordinates and first z-coordinates are received from measurements in the XYZ color space. 3×N matrices RGB_1 and XYZ_1 are constructed based on the received coordinates. A 3×3 conversion matrix C is generated to fulfil the relation XYZ_1=C*RGB_1. 展开▼
