MacAdam ellipses

ellipses, MacAdam

Areas in the CIE chromaticity diagram, each in the form of an ellipse within which the colour appears the same. The size of each ellipse varies in the diagram, being larger for greens than for blues or reds. The ellipses are distorted for colour deficient individuals.
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Also, unlike many first generation LEDs, they deliver white point accuracy within 3 step MacAdam ellipses, a standard measure of color consistency.