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GB/T 36979-2018Measuring method of spatial distribution of color characteristics for LED products (English PDF)

LED产品空间颜色分布测量方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 28, 2018

Implementation date

July 1, 2019

Scope

GB/T 36979-2018 is the English-translated version of LED产品空间颜色分布测量方法.

GB/T 36979-2018 sets out how to express and measure the colour of white LED products for lighting, meaning LED lamps, modules and luminaires, both on average and as it varies in space.

It covers chromaticity parameters, spatial chromaticity distribution, spatial average chromaticity, spatial colour non-uniformity and standard light colours with their tolerance ranges.

It fixes the measurement conditions, from laboratory, ambient and tp point temperature to air flow, supply voltage and current, operating position and stabilization, and describes the integrating sphere-spectroradiometer and the distribution spectroradiometer methods, with calibration and traceability.

Informative annexes cover measuring distance, angle scan modes and sampling interval. LED packages and OLED products are excluded, though they may refer to it. It was issued on 28 December 2018 and has applied since 1 July 2019.

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Document preview — GB/T 36979-2018

National Standard of the People's Republic of China

ICS: 29.140.40
Classification: N 35

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 color representation
4.1 Chroma parameter
4.2 Spatial chromaticity distribution
4.3 Spatial average chromaticity parameter
4.4 Spatial color non-uniformity
4.5 Standard Light Color and Color Tolerance Range
5 Measurement conditions
5.1 Laboratory Requirements
5.2 Ambient temperature
5.3 Surface temperature (tp point temperature)
5.4 Air flow
5.5 Measuring voltage and measuring current
5.6 Working attitude of the tested LED products
5.7 Stability before measurement
6 color measuring equipment
6.1 Integrating sphere-spectral radiometer (spectral radiometer as detector)
6.2 Distributed Spectroradiometer (Spectrometer as a Detector)
6.3 Requirements for the integrating sphere
6.4 Rotating table requirements for distributed spectroradiometers
6.5 Spectroradiometer Requirements
7 Chromaticity measurement of the specified direction
8 Average Chroma Parameter Measurement
8.1 Integrating sphere-spectral radiometer method
8.2 Distribution Spectroradiometer Method
9 Space color unevenness measurement
10 Calibration and traceability
10.1 Calibration of the integrating sphere-spectral radiometer
10.2 Calibration of distributed spectroradiometers
Appendix A (informative) Spectral radiation intensity measurement distance determination
Appendix B (informative) Angle scan mode
Appendix C (informative) Determination of sampling interval
Reference

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies white LED lights, white LED modules and white LED lamps (hereinafter collectively referred to as "LED products") for lighting.

The color parameter representation and the method of measuring the average color and spatial color distribution.

This standard applies to white LED products for lighting. This standard does not include LED packages and OLED (Organic Light Emitting Diode) products.

However, the above products can refer to this standard when encountering similar problems.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 2900.65-2004 Electrotechnical terminology lighting

GB/T 9468-2008 General requirements for luminometric measurement of luminaires

GB/T 24826-2016 General lighting LED products and related equipment terms and definitions

ISO 11664-1:2007/CIES014-1.2007 Chroma Part 1. CIE Standard Color Observer (Colorimetry- Part 1. CIEstandardcolorimetricobservers)

ISO 11664-2:2007/CIES014-2.2006 Chroma Part 2. CIE Standard Illumination (Colorimetry-Part 2. CIEstandardiluminants)

ISO 11664-3:2012/CIES014-3.2011 Chroma Part 3. CIE tristimulus values (Colorimetry-Part 3. CIE Tristimulusvalues)

CIE 13.3-1995 Method for measuring and characterizing the chromogenic properties of light sources (Methodofmeasuring andspecifyingcolour Renderingpropertiesoflightsources)

CIE15-2004 Colorimetry

3 Terms and definitions

GB/T 2900.65-2004, GB/T 9468-2008, GB/T 24826-2016, ISO 11664-1:2007/CIES014-1. 2007, ISO 11664-2:2007/CIES014-2.2006, ISO 11664-3:2012/CIES014-3.2011, CIE 13.3-1995, The following terms and definitions defined by CIE15-2004 apply to this document.

3.1 Total spectral radiant flux

The spectral intensity of the total radiant flux Phie of the LED product in the full geometric space (4pi solid angle) [see equation (1)].

Note: The unit is watts per nanometer (W·nm-1).

3.2 Spectral irradiance

The spectral radiant flux on the bin containing the point projected onto the face is divided by the bin area dA [see equation (2)].

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 19 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 11664-1:2007 · ISO 11664-2:2007 · ISO 11664-3:2012

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