GB/T 5702-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 5702-2019 | English | 215 |
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Method of measuring the color rendering properties of light sources
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| GB/T 5702-2003 | English | 170 |
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Methods of measuring the color of light sources
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| GB/T 5702-1985 | English | RFQ |
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Method of evaluating colour rendering properties of light sources
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GB/T 5702-2019: Method of measuring the color rendering properties of light sources---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT5702-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.180.20
A 26
Replacing GB/T 5702-2003
Method of Measuring the Colour Rendering Properties
of Light Source
Issued on. MARCH 25, 2019
Implemented on. OCTOBER 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword...3
Introduction...4
1 Scope...5
2 Normative References... 5
3 Terms and Definitions...5
4 General Requirements...6
5 Measurement of Light Source (Relative) Spectral Power Distribution... 6
6 Calculation of Colour Rendering...7
7 Report on Calculation of Colour Rendering...13
Appendix A (Informative) Other Evaluation Index and Calculation Method of
Colour Rendering of Light Source...14
Appendix B (Normative) Visible Light Spectrum Reflectance of Standard Color
Sample...16
Appendix C (Normative) Characteristic Vector of Standard Illuminator D... 23
Appendix D (Normative) Colour Matching Function of CIE 1931 Standard
Chromaticity Observer...24
1 Scope
This Standard specifies the general requirements for the evaluation on colour
rendering of light source, the measurement of spectral power distribution of light
source and the calculation of colour rendering.
This Standard is applicable to the evaluation of the colour rendering of light sources
that meet the requirements of white light sources.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) is applicable to this document.
GB/T 5700 Measurement Methods for Lighting
GB/T 7922 Method of Measuring the Colour of Light Sources
CIE 127 Measurement of LECs
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1 Colour rendering of a light source
The influence of the light source spectrum on the colour appearance of the object.
This influence is caused by the observer intentionally or unintentionally comparing it
with the colour appearance under the reference illuminator.
4 General Requirements
4.1 The colour rendering of the light source shall be quantitatively evaluated by the
colour rendering index; and also refer to Appendix A for quantitative evaluation of the
gamut area index and chromaticity index of the light source.
4.3 The selection of colour samples used for the evaluation on the colour rendering of
light source shall comply with the following provisions.
4.4 The visible light spectrum reflectance of the colour samples used for the
evaluation on the colour rendering of the light source shall be determined in
accordance with Appendix B, and the wavelength interval can be reduced by
interpolation.
5 Measurement of Light Source (Relative) Spectral
Power Distribution
5.1 Spectroradiometer performance requirements
5.1.1 The wavelength range of the spectroradiometer shall be 380nm~780nm.
5.1.4 The detector shall work within the linear range.
5.1.5 The measurement light repeatability of the spectroradiometer shall be better
than 1%.
5.3 Laboratory test conditions
5.3.1 The ambient temperature shall be (23±2) °C, and the relative humidity of the
environment shall be no greater than 65%.
5.3.2 The light source to be measured shall be tested under rated conditions, and the
power supply equipment shall comply with the following provisions.
5.3.3 Before measuring the colour rendering of the light source, the light source shall
be preheated.
5.3.4 The test site shall be free of ambient light that affects the test results.
6 Calculation of Colour Rendering
6.1 Calculation process of light source colour rendering
The calculation shall be carried out according to the calculation process specified in
Figure 1.
6.2 Determination of reference illuminator
6.2.1 The correlated colour temperature of the light source to be measured shall be
calculated according to GB/T 7922.
6.2.2 The colour temperature of the reference illuminator or correlated colour
temperature shall be the same as the light source to be measured; and the spectral
power distribution of the reference illuminator shall be calculated according to
Formula (1).
6.2.3 The chromaticity difference between the light source to be measured and the
reference illuminator shall be calculated according to Formula (8).
6.3 Calculation of colorimetric parameters
6.3.2 u, v chromaticity coordinates shall be calculated as per the Formulas (16) and
(17).
6.4 Calculation of colour rendering
6.4.1 The colour difference ΔE of the colour sample irradiated by the light source to be
measured and reference illuminator shall be calculated by Formula (25).
6.4.2 The special colour rendering index Ri corresponding to each colour sample shall
be calculated by Formula (26).
6.4.3 The general colour rendering index Ra shall be calculated by Formula (27)
according to the special colour rendering index of No.1~No.8 standard colour samples
specified in Appendix B.
7 Report on Calculation of Colour Rendering
7.1 The report on calculation of colour rendering shall clearly indicate the test
conditions such as spectroradiometer information, ambient temperature, relative
humidity, and power supply conditions, etc.
7.3 The report on calculation of colour rendering shall indicate the calculation results
of the relative colour temperature of the light source, the chromaticity difference
between the light source to be measured and the reference illuminator, and the
general colour rendering index.
Appendix A
(Informative)
Other Evaluation Index and Calculation Method of Colour
Rendering of Light Source
A.1 The necessity of supplementary evaluation index
Colour rendering index is an evaluation method based on the influence of light source
on colour fidelity. However, this method does not reflect the influence of factors such
as the increase in saturation caused by the colour difference of the colour sample
caused by the light source on human perception.
A.2 Calculation of the gamut area index of the light source
A.2.1 The colour gamut of the light source shall be calculated by Formula (A.1)
according to the standard colour samples specified in Table B.1; U*, V* shall be
calculated according to 6.3.
A.2.2 The colour gamut index Ga of light source to be measured can be calculated
according to Formula (A.2).
A.3 Calculation of chromaticity index of the light source
A.3.1 The chromaticity index of the light source can be calculated based on the
standard colour samples specified in Appendix B or the non-standard colour samples
determined by the user.
A.3.2 The chromaticity C *k,i of the colour sample irradiated by the reference illuminator
shall be determined according to the provisions of 5.2 of GB/T 7921-2008 as per the
tristimulus values of Xi, Yi and Zi calculated in accordance with provisions of 6.3.1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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