* Fixture-to-Fixture Color Consistency: A good metric for determining this with LED is to refer to Standard Deviation of Color Matching (SDCM) data, commonly referred to as "MacAdam Ellipses
," which are named after light and color studies conducted by David Lewis MacAdam.
The LumeLEX 2024 Series is designed for the Xicato LED module, which maintains color consistency (within two MacAdam Ellipses
) and intensity throughout its 50,000-hour life.
ANSI C78.377 permits white light LEDs to have variations in chromaticity within the limits of seven-step MacAdam ellipses
. This may be compared with ANSI C78.376, which specifies smaller four-step MacAdam ellipses
for linear and some compact fluorescent lamps.
(3) Satisfies "3-step MacAdam ellipse
" color-tolerance criteria at operating temperature levels encountered during practical use (Tc = 90 degrees C).