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GB/T 5702-2019: Method of measuring the color rendering properties of light sources Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 5702: Historical versions
Similar standardsGB/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/GBT5702-2019GB 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 ContentsForeword...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...241 ScopeThis 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 ReferencesThe 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 LECs3 Terms and DefinitionsFor 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 Requirements4.1 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) SpectralPower 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 Rendering6.1 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 Rendering7.1 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. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 5702-2019 be delivered?Answer: The full copy PDF of English version of GB/T 5702-2019 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 5702-2019_English with my colleagues?Answer: Yes. 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