Patent ID: 9115852
Filing Date: 2015-08-25
Classification: F21K,F21Y,H01L

Abstract:
1. A method of producing a plurality of LED illumination devices which each emit light having an average value of a first photometric parameter and a further average value of a second photometric parameter comprising: producing a plurality of LED chips which emit light of a same color; measuring values of the first photometric parameter and values of the second photometric parameter of the LED chips, wherein the first photometric parameter is a color locus and the second photometric parameter is a brightness; combining the LED chips to form groups of at least two LED chips which have different values of the first photometric parameter and different values of the second photometric parameter such that differences in the average values and differences in the further average values of all the LED illumination devices are imperceptible to the human eye; and equipping a respective LED illumination device with a group of LED chips.