The color rendering in an LED module, also called chromaticity, is a measure of the scattering of the light color. The spreads of the lights color are specified in MacAdam and the color deviations are specified in the MacAdam ellipses SDCM (Standard Deviation of Color Matching) according to the CIE 1964 standard. The color rendering or the chromaticity is graded through the MacAdam system on a scale from 1-10 - where 1 indicates the best chromaticity or the best color quality of light that you can achieve.
It can be difficult to see the difference/deviation of the colors between 1 and 3 on the MacAdam scale. If the MacAdam gets higher that 3 on the scale, the deviations in the colors become clearer, depending on the environment in which the lighting is viewed and judged. If you have to evaluate the color rendering from a wall washer or a spotlight against a white wall, then you would experience that the LED-modules requires a low MacAdam value. Indoor lighting or indoor applications normally have to reach a MacAdam requirement of maximum 3 SDCM, whereas outdoor lighting most often can be satisfied with a MacAdam on 5 SDCM due to the surroundings.
