GB/T 7922-2023Method of measuring color of light sources (English PDF)
照明光源颜色的测量方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 23, 2023
Implementation date
September 1, 2023
Scope
GB/T 7922-2023 is the English-translated version of 照明光源颜色的测量方法.
GB/T 7922-2023 is the Chinese national method for measuring the colour of light sources.
It divides the work into laboratory measurement, which verifies the performance of the source, and field measurement, which tests the lighting effect produced by an installation, and covers the colour evaluation indices, measuring conditions, instruments and the setting of the source under test, then the processing of results: total spectral radiant flux, tristimulus values, chromaticity coordinates and the colour evaluation items for white and for coloured sources.
Normative annexes carry the CIE 1931 and CIE 1964 standard observer colour-matching functions and the calculation of colour tolerance. This edition adds terms such as colour gamut and gamut coverage.
It replaces GB/T 7922-2008, was issued on 23 May 2023 and has applied since 1 September 2023.
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Document preview — GB/T 7922-2023
National Standard of the People's Republic of China
- ICS
- 17.180.20
- Classification
- A 26
- Replacing
- GB/T 7922-2008
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Measurement method
- 4.1 Classification of measurement methods
- 4.2 Light source color evaluation index
- 4.3 Measurement conditions
- 4.4 Measuring instruments
- 4.5 Measured light source and setting
- 4.6 Laboratory measurements
- 4.7 On-site measurement
- 5 Processing of measurement results
- 5.1 Calculation of total spectral radiant flux
- 5.2 Calculation of tristimulus values
- 5.3 Calculation of chromaticity coordinates
- 5.4 Calculation of color evaluation items of white light source
- 5.5 Calculation of Color Evaluation Items for Colored Light Sources
- 5.6 Calculation of other color evaluation items
- 6 Test report
- Appendix A (Normative) CIE1931 Standard Chromaticity Observer Color Matching Function
- Appendix B (Normative) CIE1964 standard chromaticity observer color matching function
- Appendix C (Normative) Calculation of Color Tolerance
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.
This document replaces GB/T 7922-2008 "Measurement method for color of lighting source". Compared with GB/T 7922-2008, except for structural In addition to rectification and editorial changes, the main technical changes are as follows:
a) The content of the scope of the standard has been changed (see Chapter 1, Chapter 1 of the 2008 edition);
b) Added terms and definitions such as color gamut and color gamut coverage (see Chapter 3);
c) Changed the test method (see Chapter 4, Chapter 4 of the 2008 edition);
d) The method for measuring and calculating the color consistency of the surface of the lighting source has been added (see 4.6.5 and 5.6.2);
e) Increase the spatial color uniformity of the lighting source (see 5.4.2);
f) The calculation method of color evaluation items for colored light sources has been added (see 5.5);
g) The color consistency calculation method in the dimming process of the lighting source is added (see 5.6.3).
1 Scope
This document specifies the measurement method for the color of the lighting source, the processing of the measurement results, and the test report.
This document is applicable to the measurement of the color of various lighting sources (hereinafter referred to as "light sources").
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 5698 Color Terminology
GB/T 7921 Uniform color space and color difference formula
GB/T 9468 General Requirements for Photometric Measurement of Luminaires
GB/T 39394 Test methods for LED lamps, LED lamps and LED modules JJG213 distribution (color) temperature standard lamp
3 Terms and Definitions
The following terms and definitions defined in GB/T 5698 apply to this document.
3.1 Color gamut
The range of colors that can be represented by radiation from a light source or system.
3.2 color gamut coverage
In the CIE1976LUV uniform chromaticity u', v' chromaticity scale diagram, the area of the polygon formed by the chromaticity coordinates of each primary color accounts for the spectral color rail Percentage of the area within the trace (0.1952).
4 Measurement method
4.1 Classification of measurement methods
Light source color measurement is divided into laboratory measurement and field measurement according to the measurement location. Laboratory measurements verify the performance of the light source. Field measurements The lighting effect produced by the lighting installation can be tested.
4.2 Light source color evaluation index
4.2.1 According to the type of light source, the following classifications can be made.
a) According to the color of the light source, it can be divided into white light source and colored light source;
b) According to the dimming characteristics of the light source, it can be divided into dimmable light source and non-dimmable light source;
c) According to the number of packaged light sources in the light source, it can be divided into single-channel light source, double-channel light source and multi-channel light source.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
Cited by
- GB 23826-2025Light-emitting diode variable speed limit signs of motorway
- GB 7793-2025Hygienic standard for day lighting and artificial lighting for middle and elementary school
- GB/T 24725-2024Raised pavement markers
- YY 0792-2024Ophthalmic instruments - Endoilluminators
- GB/T 5700-2023Methods of lighting measurement
- GB/T 41434-2022Paper, board and pulps - Basic terms for optical properties
Similar standards
Editions of GB/T 7922
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 7922-2023 | Method of measuring color of light sources | current edition | Current |
| GB/T 7922-2008 | Method of measuring color of light sources | previous edition | Superseded |
This page sells the current edition, GB/T 7922-2023. Earlier editions are listed for reference only.
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Related Standards
GB/T 39394-2020 — Test method for LED lamps, LED luminaires and LED modules
GB/T 5698-2001 — Glossary of color terms
GB/T 7921-2008 — Uniform color space and color difference formula
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