SDCM, which is the standard deviation of color matching. The color tolerance is the difference between the computer-calculated formula and the target standard, calculated under a single lighting source, the smaller the value, the higher the accuracy. Note, however, that it only represents a comparison of colors under a certain light source and fails to detect deviations under different light sources. The difference between the spectrum emitted by the light source and the standard spectrum.
McAdam elliptic theory: In 1942, scientist McAdam used the related principle to conduct experiments on 25 colors, measured in each color point about 5 to 9 lateral direction, recording the distance between two points when they were just able to distinguish the color difference, and the result was a number of ellipses with different area sizes and different long and short axes, called McAdam ellipses. The McAdam ellipse is usually described by "order", where "order" actually means the standard deviation. 1st order McAdam ellipse refers to the standard deviation of the color matching result change one time away from the target color, and similarly, the meaning of 3rd order, 4th order, etc.
Color tolerance is an important indicator in terms of color performance. The smaller the value, the higher the accuracy, when calculated with a single illumination source. The standard spectrum changes with the color temperature, the same light source if the standard spectrum is different its color tolerance is also different, but in the measurement, the general photoelectric analysis system will automatically identify the measured light source is located in the color temperature range, in order to determine the color temperature of the standard spectrum to take the value.
The significance of color tolerance in fluorescent lamps due to the different densities of red, green and blue powder, the production is easy to cause color temperature difference, once it occurs, the color temperature difference needs to be adjusted by adjusting the color tolerance to ensure the light color of the lamp, the instrument that can display the color tolerance. As a lighting source of white LED should refer to the standard of color tolerance to guide the development and application of new white LED lighting source requirements.
The EU standard ERP, in accordance with the explicit technical requirements to regulate the LED division area, SDCM≤ 6. ADAYO lighting as a led downlight supplier, this 12W downlights we are able to achieve SDCM<6, in compliance with the new ERP standard.
