The definition of the color of the international lighting Committee (CIE) is defined as: compared with the standard High CRI cold light source, the effect of a CRI 90 cold light source on the color appearance of the object. In other words, High CRI LED cold light source and standard light source (for example, daylight)

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compared to a measurement in color identification. CRI is a widely accepted measurement standard, and it is the only way to evaluate and report the color rendering of high CRI cold light source. CRI the measurement of the establishment is not far away, at first the standards is to use it to describe color fluorescent lamp widely used since 1960s, and to help users understand the High CRI LED cold light source spectral distribution of a linear fluorescent lamp can be applied to the occasions on which.

The measurement and provisions of the CRI 14 color samples (hereinafter referred to as the "color") the difference between appearance and standard displays in the measured 90 CRI cold light source under the reference of high CRI cold light source showing the appearance of the closely related. Although the CRI is derived by source mathematical method and a practical color map can not be used for the determination of CRI value,but these color colors are real, they are from Munsell color samples.

The calculation of CRI

Although carefully defined the color samples, and real objects can produce these color color, but the CRI value is completely derived by calculation, high CRI LED cold light source and this is very important, the need for real high CRI cold light source irradiation true color spectrum, High CRI LED cold light source people have to do is use the measured CRI 90 cold light source spectrum with the specified color sample is compared to a CRI value calculation method and then through mathematical analysis.

Based on the comparison of color perception is also very meaningful, the premise is high CRI cold light source and reference 90 CRI cold light source of the two must be the same. For example, to compare color 2900K color warm white light source and cold white light 5600K (sunlight) appearance differences under the irradiation of two pieces of the same color samples is a complete waste of time. They must look different. Therefore, the first step is to be through the color spectrum altimeter LED cold light source to calculate its correlated color temperature (CCT). Once you have this color, another one of the same color reference CRI 90 cold light source can be created by mathematical method. For the light source color temperature measured below 5000K, reference blackbody source selection (Planck) and for the radiator; color temperature above 5000K high High CRI LED cold light source color cold light source, high CRI LED cold light source selection CIE standard illuminant D. Can now refer to the high CRI LED cold light source of the spectrum and the combination of each color, produce a set of ideal reference color coordinates (referred to as the color point). For the measured CRI 90 cold light source is also the case, the measured CRI 90 cold light source spectrum with each color sample, get another set of color points. If the high color color color under cold light source and the reference light source completely correspond to the same color, we think they are of the same, and the CRI value is 100. In the color chart, high color color cold light under the farther away from the ideal position corresponding to the color, then the worse, the CRI value is low

We are focus on the special LED and application module on the medical lighting and UV market.please contact us:kevin@sunerled.com or http://www.sunerled.com/English/