led light

What is 3 step Mac-adam

SDCM is acronym which strands for strandard deviation color matching sometimes known as a "MACADAM ellipse" A 1-step Macadam ellipsedefines a zone in the CIE 1931 2DEG(XY) color space within which thehuman eye cannot discern color difference.Most LEDs are binned at the four toseven step level,So youcan often see color differences in LEDs thatare ostensibly thesamecolour.