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The SDCM (Standard Deviation of Color Matching) measured value specifies the chromaticity locus stability of LEDs: this is important particularly for the operating duration of LED luminaires. The human eye is very sensitive to the color differences in light sources. The lower the SDCM value, the tighter color tolerance is. ERCO uses LED modules with 1.5 SDCM to maintain their high-quality, prestigious impression across the entire service life of the lighting installation. The animation illustrates the effect of chromaticity locus stability for 50,000 operating hours. ERCO luminaires with high-power LEDs with 1.5 SDCM (on the left) display no significant color differences. Luminaires with standard LEDs with SDCM<5 for up to 50,000 operating hours (on right) display clearly visible color differences.