MacAdam-Ellipse

The color location tolerance is described in the MacAdam ellipse. The color value proportions of a certain color can be described exactly by x and y coordinates in the CIE color diagram (according to color chart CIE 1931; DIN 5033). The achromatic point (the color white), for example, has coordinates x = 0.333 and y = 0.333. During the production of LED chips, tolerances occur that can lead to differences in the light color, among other things. Therefore LED´s are measured after production and divided into tolerance classes. This process is called "color binning". A color bin corresponds to a certain (square) area in the CIE color triangle. A standard binning structure of the ANSI (American National Standards Institute) has existed since 2008.