How each value of the color rendering index R1R15 is obtained

Choose a standard light source with the same color temperature as the measuring light source (or close to it), and its fourteen (plus Asian women's **color) specified color rendering index is set at 100

With the same fourteen (plus Asian women's ** color) specified color measurement light source irradiation color difference and standard light source light illumination color color difference δei then a color rendering index: ri = 100 -

Take the first eight of the fourteen colors, R1, R2, 、..R8 is added and averaged, and then the Ra is called the general color rendering index, which represents the color rendering performance of the light source.

Different instrument companies, the format of the test report is somewhat different, and the content is similar. Take the report sheet on the first floor as an example. One.

In the test report of the electric light source of energy-saving lamps, it mainly looks at: 1. The color of the light emitted by the energy-saving lamp, and how much is the difference between the color of the light and the requirements. The light color is expressed by the color coordinates x and y values, and it is customary to use the correlated color temperature (referred to as color temperature).

The difference between the light color and the required is expressed by the SDCM. The 6 light colors specified in the national standard are shown in the following table, and the requirements (from the provisions x and y) do not exceed 5 SDCM. Number: Name, Symbol, X Y, Color Temperature, RA, F6500, Daylight, Rr

313 .337 6430 80 F5000 Neutral White Rz346 .

359 5000 80 F4000 Cool White rl380 .380 4040 80 F3500 White RB

409 .394 3450 80 f3000 warm white rn440 .

403 2940 82 F2700 Incandescent Lamp Color rd463.420 2720 82 2, the color rendering of light, expressed by the color rendering index RA, the requirements are shown in the above table.

3. The brightness and luminous effect of the lamp, the brightness is expressed by luminous flux, the unit is "lumens (lm)", according to customer requirements; Light Utility Luminous efficiency is expressed in "lumens watts (lm w)", according to customer requirements. Whether the lamp is energy-saving mainly depends on the light efficiency. The luminous effect is given directly in the CFL report.

Two. In the report, the significance of other items and the values that should be noted. 1. Test conditions.

The test temperature should be around 25 degrees, otherwise the light efficiency will be affected. The test range is not less than 380-780nm. The sampling interval is not greater than 5 nm.

2. Light color parameters. The color coordinates u, v, are the rotation of x and y.

Color rendering indices R1 to R15, which are the 15 colors specified by the CEI (see table below); The reflected light of these colors under the illumination of the light source to be evaluated is compared with the reflected light under the illumination of a standard light source of the same brightness and basically the same color temperature. No difference is 100, and the larger the difference, the smaller the value.

The average value of R1 to R8 is the general color rendering index Ra

R1 to R15 in the color rendering index represent the colors in daylight, respectively.

Color name: Munsell number.

R1: Pale gray-red 6 4

r2: dark gray-yellow 6 4

r3: saturated yellow-green 6 8

R4: Medium yellow-green 6 6

R5: Pale blue-green 6 4

r6: light blue 6 8

r7: lavender blue 6 8

r8: reddish-purple 6 8

r9: Saturated red 4 13

R10 Saturated Yellow 8 10

R11 Saturated Green 5 8

R12 Saturated Blue 3 11

R13 Caucasian Complexion 8 4

R14 Leaf Green 4 4

R15 Yellow skin tone.

The color rendering index Ra is the average of the color rendering index of the first 8 colors.

R1, pale grayish-red.

R2, dark gray-yellow.

R3, saturated yellow-green.

R4, medium yellow-green.

R5, pale blue-green.

R6, light blue.

R7, light purple blue.

R8, pale reddish-purple.

r9, saturated red.

r10, saturated yellow.

R11, saturated green.

R12, saturated blue.

R13, Caucasian complexion.

R14, foliage green.

R15 Yellow skin tone.

Ra is the color rendering index. In order to quantitatively evaluate the color rendering of the light source, the concept of color rendering index is introduced. Based on the standard light source, the color rendering index was set at 100, and the color rendering index of the other light sources was lower than 100.

General definition: The color rendering index is the percentage of realism that an object perceives under a light source and how it perceives it in sunlight. Light sources with a high color rendering index are more realistic in their representation of colors, and the closer the objects are to the natural flavor of the eyes.