Methods of measuring the color of light sources

This standard specifies a method for quantitatively evaluating the color rendering of a light source based on the total color shift of a color sample under the illumination of a reference light source and a light source to be tested. This standard applies to the evaluation of the color rendering of artificial lighting sources, such as incandescent lamps, halogen tungsten lamps, various gas discharge lamps (fluorescent lamps, high pressure sodium lamps, metal halide lamps, xenon lamps, etc.), artificial daylight, etc., except for light sources with dominant monochromatic radiation such as low pressure sodium lamps, etc. GB/T 5702-2003 Method for evaluating the color rendering of light sources GB/T5702-2003 standard download decompression password: www.bzxz.net
This standard specifies a method for quantitatively evaluating the color rendering of a light source based on the total color shift of a color sample under the illumination of a reference light source and a light source to be tested. This standard applies to the evaluation of the color rendering of artificial lighting sources, such as incandescent lamps, halogen tungsten lamps, various gas discharge lamps (fluorescent lamps, high pressure sodium lamps, metal halide lamps, xenon lamps, etc.), artificial daylight, etc., except for light sources with dominant monochromatic radiation such as low pressure sodium lamps, etc.

GB/T5702—2003
This standard is an abbreviation of the method for measuring and evaluating the color rendering of light sources recommended in the publication of the International Committee for the Standardization of Colors (CIEN.13.3-1S95).
This standard is a revision of GR/T5702—1985 "Method for evaluating the color rendering of light sources". Compared with GB/T5702—1935, the main changes are as follows:
Add the preface, the specifications and the third paragraph, and rearrange the section numbers. Correct the printing errors and some contents in the original standard. Delete the 7th to 12th lines of the original standard and delete the table. Delete the 22nd line of page 3 and delete Table 6. From the date of implementation, this standard will replace GB/T5702—1985. This standard is proposed and managed by the National Technical Committee for Color Standardization. This standard is drafted by China Academy of Building Research. The main drafters of the standard are: Li Yaqiong, Yue Jiaohua, Zhang Ping. The previous version replaced by this standard is: G/T 3702-198: 1 Scope
Evaluation method of color rendering properties of light sources
GB/T 5702—2003
This standard specifies a method for quantitatively evaluating the color rendering properties of light sources based on the total color shift of the test color sample under illumination with low light source and continuous light source.
This standard applies to the evaluation of color rendering of artificial lighting sources, such as incandescent lamps, halogen tungsten lamps, various gas-effect electric lamps (fluorescent lamps, high-voltage halogen lamps, metal halide lamps, etc.), artificial daylight, etc., except for light sources with dominant monochromatic emission such as high-voltage sodium lamps. 2
Normative referenced documents
The clauses in the following documents become clauses of this standard through reference in this standard. For any referenced document, all subsequent amendments (excluding errors) or revisions are not applicable to this standard. However, it is encouraged to reach an agreement based on this standard. The parties to the agreement shall investigate whether the latest version of this document can be used. For any undated referenced document, the latest version shall apply to this standard. GBT3977 Color Rendering Method
3 Evaluation method
3.1 Selection of reference light item
When evaluating the color rendering properties of a light source, a real light source is used. The optical power distribution of the reference light is defined by a mathematical formula. When the correlated color temperature of the light source to be tested is not higher than 5000K, the Planck radiator is used as the reference light source, and its spectral power distribution is calculated using the Planck formula, see formula (1).
SA) = ca-d
Wherein:
S(a).-a light source spectral power distribution
First topological constant, unit °
c,=3.741 77×10- wm
First spectral constant, unit mK
:=1.488 8X10 *mK
Wavelength, unit m
Distribution temperature+unit K,
When the relevant color temperature of the light source to be measured is higher than 5000K, the combined light is used as the reference light source. When the relevant color temperature of the light source to be measured is above 5000K, the spectral dynamic distribution S(1) of the reference light source is calculated according to formula (2). S() =S,()- MS(a) I MS()
Wherein:
S.(1>, S<).S%Calculate the color difference AE between the :th test color sample under the illumination of the test light source and the reference light source. aE, -((W.-w..)\ I (U..U.\+(V...V..t)-((awr + (AUt +(ave)))
The subscripts in the formula have the same meaning as before.
4 Color rendering index
4.1 Symbols for color rendering index
The letter R represents the color rendering index, R, represents the special color rendering index, and R, represents the general color rendering index. 4. 2 Calculation of special color rendering index
Use formula (21) to calculate the special color rendering index, R, = I00 -4. 6AE,
....(21)
GB/T 5702—2003
Calculation station results in the nearest drum number after rounding off. 43 Calculation of general color rendering index
-General color rendering index is the mountain 8 special color rendering index (1=1, \, 8) calculated by taking the average value, see formula (22) R=
Capsule 1 real combination light spectrum distribution coefficient Airm
— 12. 0
.-2. 9
-(22 )
.0. 244
G- 283
CIL A color rendering index calculation uses 1~white color sample light error brightness coefficient purchase 4
center, 131
center 151
c- 205
GB/L5702—2003
th zhich
0- 354
GB/T 5702—2003
2, 455
0, 33F
5, 325
heart, 23
heart216
Shuang2(mite）
c- 400
A/ntti
Table 3 Spectral significance coefficients of color samples No. 9 to 15 used in the calculation of CIE special color rendering indexes 10
GB/T5702—2003
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CB/T 5702—2003
c, #51
Capsule 3 (continued)
3, 747
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c- 109 E
c- 230 4
0, o 1
(0. 091 2
6, C02 2
. 060 c
GB/T5702—2003
0. D.s6 2
. (067 3
0. (042 2
.cos r
GB/T 5702-2003
Sum by m
(1)=21.371 4
Ey()=21. 371 1
2=21.371 5
0. 642. 4
0. 0G± 1
, Heart x
Table 4 ( continued)
0, 623 2
0, 002 0
0. 00± 5
. k: 4
. oG 1
D. Uoo ti
15. onn 2
5, 000 0
n, oc 0
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