Three-digit code for designation of colour rendering and correlated colour temperature

IEC/TR 62732:2012(E) describes how to construct a three-digit code, representing a shorthand string combining the nominal general colour rendering index and the nominal correlated colour temperature. The contents of the corrigendum of December 2012 have been included in this copy.

General Information

Status
Published
Publication Date
09-Jan-2012
Drafting Committee
WG 6 - TC 34/SC 34A/WG 6
Current Stage
PPUB - Publication issued
Start Date
10-Jan-2012
Completion Date
30-Apr-2012

Relations

Effective Date
10-Feb-2026
Effective Date
10-Feb-2026
Effective Date
10-Feb-2026
Effective Date
10-Feb-2026
Effective Date
05-Sep-2023

Overview

IEC TR 62732:2012 provides guidance on the construction and use of a three-digit code that succinctly represents both the nominal general colour rendering index (CRI) and the nominal correlated colour temperature (CCT) of lamps. This standardized code is widely recognized in the lighting industry, offering a practical shorthand for specifying critical color characteristics of electric light sources. Developed by the International Electrotechnical Commission (IEC), this report aids manufacturers, specifiers, and end-users in quick, consistent communication of lamp color properties for a range of applications.

Key Topics

  • Three-Digit Code Structure: The code format is 'xyy', where 'x' stands for the general colour rendering index category and 'yy' corresponds to the correlated colour temperature.
    • Colour Rendering Index Designation: The first digit indicates the CRI band:
      • "7" for CRI 70-79
      • "8" for CRI 80-89
      • "9" for CRI 90 and above
      • Codes below "7" are extrapolated as needed.
    • Correlated Colour Temperature Designation: The following two digits represent the CCT value in hundreds of Kelvin (K), rounded to the nearest whole number.
  • Industry Application: The code is deeply integrated into lamp labeling, product datasheets, and technical specifications worldwide.
  • Harmonization: Aligns with references such as IEC 61231 for further consistency in lamp coding systems.

Applications

The IEC TR 62732 three-digit code serves essential roles across the lighting and electrical sectors, including:

  • Product Identification: Quickly conveys essential color properties on lamp packaging, datasheets, and specifications, enabling easier product comparison and selection.
  • Inventory and Procurement: Standardized codes streamline communication between manufacturers, distributors, and service providers, reducing errors in ordering and stocking.
  • Lighting Design and Specification: Lighting professionals rely on the three-digit code to ensure compatibility with project requirements for color quality and appearance.
  • Regulation and Compliance: Used by regulatory bodies and market surveillance for the enforcement of color rendering and temperature standards in lighting products.
  • End-User Reference: Helps customers choose lamps with the right color temperature and rendering qualities for residential, commercial, or industrial environments.

Example: A lamp labeled "830" has a nominal CRI between 80-89 and a correlated color temperature of approximately 3000K.

Related Standards

Utilizing IEC TR 62732:2012 often involves referencing or aligning with additional key international standards, such as:

  • IEC 61231: International lamp coding system (ILCOS) - provides a broader framework for lamp identification and coding.
  • ISO/IEC Directives: Ensure that coding practices conform to international documentation and standardization guidelines.
  • Other IEC Standards for Lamps and Luminaires: Many product standards cite the three-digit code system to harmonize color property communication across applications.

Practical Value

Adoption of the IEC TR 62732 three-digit code promotes clear, uniform communication of lamp color properties across global markets. It minimizes misunderstandings, supports swift decision-making, and enhances compliance with product labeling regulations. By following this standard, organizations ensure that key information about color rendering and temperature is reliably conveyed, contributing to better lighting solutions and satisfied end-users.

For further references and the most current documentation, consult the IEC webstore and the latest editions of related standards.

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IEC TR 62732:2012 - Three-digit code for designation of colour rendering and correlated colour temperature Released:1/10/2012

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Frequently Asked Questions

IEC TR 62732:2012 is a technical report published by the International Electrotechnical Commission (IEC). Its full title is "Three-digit code for designation of colour rendering and correlated colour temperature". This standard covers: IEC/TR 62732:2012(E) describes how to construct a three-digit code, representing a shorthand string combining the nominal general colour rendering index and the nominal correlated colour temperature. The contents of the corrigendum of December 2012 have been included in this copy.

IEC/TR 62732:2012(E) describes how to construct a three-digit code, representing a shorthand string combining the nominal general colour rendering index and the nominal correlated colour temperature. The contents of the corrigendum of December 2012 have been included in this copy.

IEC TR 62732:2012 is classified under the following ICS (International Classification for Standards) categories: 29.140.01 - Lamps in general. The ICS classification helps identify the subject area and facilitates finding related standards.

IEC TR 62732:2012 has the following relationships with other standards: It is inter standard links to EN 62612:2013, EN 62612:2013/A2:2018, EN 61231:2010/A1:2013, EN 62922:2017, IEC TR 62732:2012/COR1:2012. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

IEC TR 62732:2012 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


IEC/TR 62732 ®
Edition 1.0 2012-01
TECHNICAL
REPORT
Three-digit code for designation of colour rendering and correlated colour
temperature
IEC/TR 62732:2012(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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IEC/TR 62732 ®
Edition 1.0 2012-01
TECHNICAL
REPORT
Three-digit code for designation of colour rendering and correlated colour

temperature
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
F
ICS 29.140 ISBN 978-2-88912-868-6

– 2 – TR 62732 © IEC:2012(E)
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Construction of the code . 6
3.1 General . 6
3.2 Digit x. 6
3.3 Digits yy . 6
3.4 Example . 6

TR 62732 © IEC:2012(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_______________
THREE-DIGIT CODE FOR DESIGNATION OF COLOUR RENDERING
AND CORRELATED COLOUR TEMPERATURE

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant
...

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