What is SDCM?
CIE Color Space
To better study the light and color, the International Commission on Illumination(CIE) create the CIE 1931 color spaces in 1931 by David MacAdam. As the left picture shows.
Most of the color can be indicate in the CIE color space by using (X, Y).
SDCM
SDCM(Standard Deviation Color Matching), is used to describe how close between two colors/light source(two points can be indicate in CIE color space), or how close between a human light source and standard light source(nautral light/sunlight). If two colors are within 1 standard deviation(SDCM<1, 1 Step), they looks almost the same.
The SDCM used by David MacAdam in 1942.
Black-Body Curve in Color Space
CIE 1931 color space
What is ANSI standard?
ANSI C78.377-2015/2017
American National Standard for Electric Lamps-Specifications for the Chromaticity of Solid-state Lighting Products.
Four-step MacAdam ellipses are used in ANSI C78.376.
Seven-step MacAdam ellipses are used in the ENERGY STAR specification for Lamps(V1.0)
Nominal CCT Categories
Nominal CCT(K) | Target CCT and Tolerance(K) | Center(x, y) |
2200 | 2238±102 | (0.5018, 0.4153) |
2500 | 2460±120 | (0.4806, 0.4141) |
2700 | 2725±145 | (0.4578, 0.4101) |
3000 | 3045±175 | (0.4439, 0.4033) |
3500 | 3465±245 | (0.4078, 0.3930) |
4000 | 3985±275 | (0.3813, 0.3797) |
4500 | 4503±243 | (0.3613, 0.3670) |
5000 | 5029±283 | (0.3446, 0.3551) |
5700 | 5667±355 | (0.3287, 0.3425) |
6500 | 6532±510 | (0.3123, 0.3283) |
ANSI 4 Step and 7 Step MacAdam Ellipses
Mostly, this standard used in North American, however MEKONG LIGHT could do customization solutions for customers.
What is ErP standard?
IEC 60081
Colour | Tc | Center(x, y) |
F 6500 | 6400 | (0.313, 0.337) |
F 5000 | 5000 | (0.346, 0.359) |
F 4000 | 4040 | (0.380, 0.380) |
F 3500 | 3450 | (0.409, 0.394) |
F 3000 | 2940 | (0.440, 0.403) |
F 2700 | 2720 | (0.463, 0.420) |
IEC 60081 3 step and 5 step MacAdam Ellipses
The IEC 60081 covering more countries, it’s an international standard. Always inform MEKONG LIGHT your standard before ordering.