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GB/T 5699-2025 English PDF

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GB/T 5699-2025: Method of daylighting measurements
Status: Valid

GB/T 5699: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 5699-2025English599 Add to Cart 5 days [Need to translate] Method of daylighting measurements Valid GB/T 5699-2025
GB/T 5699-2017English419 Add to Cart 4 days [Need to translate] Method of daylighting measurements Valid GB/T 5699-2017
GB/T 5699-2008English799 Add to Cart 4 days [Need to translate] Method of daylighting measurements Obsolete GB/T 5699-2008
GB/T 5699-1985English359 Add to Cart 3 days [Need to translate] Methods of daylighting measurements Obsolete GB/T 5699-1985

Standard similar to GB/T 5699-2025

GB/T 51033   GB/T 50082   GB/T 5699   

Basic data

Standard ID GB/T 5699-2025 (GB/T5699-2025)
Description (Translated English) Method of daylighting measurements
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard A25
Classification of International Standard 13.180
Word Count Estimation 30,366
Date of Issue 2025-08-01
Date of Implementation 2026-02-01
Older Standard (superseded by this standard) GB/T 5699-2017
Issuing agency(ies) State Administration for Market Regulation, Standardization Administration of China

GB/T 5699-2025: Method of daylighting measurements

---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/GBT5699-2025
ICS 13.180 CCSA25 National Standard of the People's Republic of China Replaces GB/T 5699-2017 Daylight measurement methods Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General Requirements 3 5 measuring instruments 4 6 Daylight Factor 5 7 Window-to-floor area ratio and lighting-compliant area ratio 7 8 Brightness and glare 8 9 Physiologically equivalent illuminance and field of view 8 10 Material optical parameters 10 11 Measurement Records 12 Appendix A (Normative) Sunny Day Side Lighting Measurement Method 14 Appendix B (Normative) Requirements for the arrangement of measurement points in school classrooms and rooms connected to balconies in residential buildings 16 Appendix C (normative) Calculation of window discomfort glare 18 Appendix D (Informative) Daylighting Measurement Record Form 20 Reference 25 Preface 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 5699-2017 Daylighting Measurement Methods. Compared with GB/T 5699-2017, except for structural adjustments and editorial In addition to the modifications, the main technical changes are as follows. a) Deleted the conformity determination (see 6.5, 7.3, 8.2.2, and 9.2.4 of the.2017 edition); b) Added requirements on measurement content (see 4.3); c) Added requirements for image luminance meters (see 5.2); d) Added requirements for gloss meters (see 5.4); e) Added the requirements for the observation positions of window brightness and background brightness when measuring the discomfort glare index of windows (see 8.1); f) Added physiological equivalent illuminance measurement requirements (see 9.1); g) Added the measurement requirements for field of view (see 9.2); h) Added the requirements for specular gloss measurement (see 10.4); i) Added measurement point layout requirements for school classrooms and rooms connected to balconies in residential buildings (see Appendix B). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Technical Committee on Ergonomics Standardization (SAC/TC7). This document was drafted by. China Academy of Building Research Co., Ltd., China National Institute of Standardization, Beijing Green Building Software Co., Ltd., Chongqing University, South China University of Technology, Tongji University, Jianke Environmental Energy Technology Co., Ltd., Beijing Construction Engineering Quality Inspection No. 6 Co., Ltd. Co., Ltd., Jiangsu Simba New Materials Technology Co., Ltd. The main drafters of this document are. Zhang Bin, Ran Linghua, Luo Tao, Zhang Xin, Zhang Jinqian, Liang Shuying, Bian Yu, Wu Yujie, Zhang Jinhua, Wang Guohua, Wei Shanshan, Wang Man. The previous versions of this document and the documents it replaces are as follows. --- GB/T 5699-1985 was first issued in 1985; --- In the first revision in.2005, the contents of GB/T 13378-1992 “Methods for measuring daylighting on sunny days” were incorporated; ---2017 was the second revision; ---This is the third revision. Daylight measurement methods

1 Scope

This document specifies the general requirements for daylighting measurement, measuring instruments and daylighting factor, daylighting standard area ratio, brightness, physiological equivalent illuminance, visual Measurement method of field and material optical parameters. This document is applicable to the daylighting measurements of all types of buildings with top or side lighting, including the daylighting measurements of buildings using light pipe lighting systems.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 5702 Evaluation method for color rendering of light sources GB/T 20148 Spatial distribution of sunlight - CIE general standard sky JGJ/T 119 Architectural Lighting Terminology Standard JJG211 Luminance Meter Verification Procedure JJG245 Light Meter Verification Procedure JJG696 Verification Procedure for Mirror Gloss Meters and Gloss Plates

3 Terms and Definitions

The terms and definitions defined in JGJ/T 119 and the following apply to this document. 3.1 A lighting system that collects natural light and transmits it through pipes into the room for natural lighting. Note. A light pipe lighting system usually consists of a light collector, a light pipe and a diffuser. 3.2 (Light) illumination iluminance The quotient of the luminous flux dΦ incident on the surface element containing the point divided by the area dA of the surface element. Note. The unit is lux (lx). [Source. GB/T 50034-2024, 2.0.7] 3.3 luminance The luminous flux per unit area and per unit solid angle of the luminous surface in a specified direction. It is determined by the formula L=d2Φ/(dA·cosθ·dω) The unit is candela per square meter (cd/m2). Where. dΦ ---The luminous flux transmitted by the beam element at a specified point within the solid angle dω containing the specified direction, in lumen (lm); dA---the cross-sectional area of the beam including the given point, in square meters (m2);

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