CRI is a measurement unit High CRI LED light source definition and color are used in the standard comparison of different high CRI light source conditions (that is, heat sink or sunlight).

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When the high CRI light source color rendering index is calculated, it can be rated from 0 - 100. This scale, one of the 100 on behalf of all the High CRI LED light source color samples in the light source problem, it seems that there are the same color, the same high CRI light source sample reference light source irradiation. Negative CRI can be calculated, but for most High CRI LED light source the goal of generating white light is to have a positive CRI.CIE report on the preparation technology of CRI (International Lighting Committee) divided into 1 visual and color.Calculation CRI

(1)    high CRI light source color data must be from the CIE 1931 values (X, Y, Z, x, y,) (U, V) of the coordinate figure 1960 through the following ways:

(2)    u = 4X/(X + 15Y + 3Z)                  (1-1a)

v = 6Y/(X + 15Y + 3Z)                   (1-1b)

(2) High CRI LED light source K, color adaptation due to adapt to the different conditions of the lamp to test, with reference light source, high color LED in R, suitable for the following ways formula:

 CRI is the color of the chromaticity coordinates of a test sample, the high CRI light source color adaptation, by moving the light source for test of a reference light source to obtain, that is u'k = High CRI LED light source v'k = VR and not should be mixed with the CIE 1976 u and V coordinates.

(3) as a function of C and D are used in equation (1-2) shall be calculated for high CRI light source, High CRI LED light source,and so on, and color test sample high CRI light source under test, high CRI light source, High CRI LED light source, according to the following formula test c = (4 - u - 10v)/v            (1-3)
d = (1.708v + 0.404 - 1.481u)/v

(4) Color imetric data must now be transformed into the 1964 Uniform Space coordinates by the following:

       The values u'k = ur, v'k = vr are the chromaticity coordinates of the light source to be tested after consideration of the adaptive color shift.  The values Yr,i and Yk,i must be normalized so that Yr = Yk = 100.

(5) The color difference between the color of the High CRI LED light source and the reference value must be calculated in the test lamp K. The following 1964 color difference formulas should be used

(6) The color difference between the color of the high CRI light source and the reference value must be calculated in the test lamp K. The following 1964 color difference formulas should be used

Ri = 100 - 4.6DEi                                 (1-6)

(7) Calculate the general Color Rendering Index, CRI, by the following 

The calculation uses 8 test color samples typically.

                                                         

topWe 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/