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
05-Sep-2023

Overview

IEC TR 62732:2012 is an International Electrotechnical Commission technical report that establishes a three-digit code for the concise designation of colour rendering and correlated colour temperature (CCT) for lighting products. This coding system condenses important lighting characteristics-specifically, the nominal general Colour Rendering Index (CRI) and the nominal CCT-into a simple code to promote clarity and uniformity in industry communication.

This technical report provides a standardized method for representing combined colour rendering and temperature parameters, widely implemented in commerce and industry where lamp quality and characteristics are critical. IEC included corrections issued in the December 2012 corrigendum to ensure accuracy and consistency.

Key Topics

  • Three-Digit Code Construction
    The code format is xyy, where:

    • x denotes the nominal general colour rendering index (CRI) category.
    • yy represents the nominal correlated colour temperature (CCT), divided by 100 and rounded to the nearest integer.
  • CRI Coding (Digit x):

    • 7 refers to CRI from 70 to 79
    • 8 refers to CRI from 80 to 89
    • 9 refers to CRI of 90 or above
      Values below 70 can be approximated by analogy.
  • CCT Coding (Digits yy):

    • The nominal CCT is divided by 100 and rounded (e.g., 3000 K becomes 30).
    • This method applies to CCTs below 10,000 K.
  • Example:

    • Code 830 means:
      • CRI between 80 and 89
      • Nominal correlated colour temperature approximately 3000 K.
  • Normative Reference:

    • IEC 61231:2010, International Lamp Coding System (ILCOS), which supports the code's application and accuracy.

Applications

The IEC TR 62732:2012 code is highly practical for:

  • Lighting Product Labeling:
    Manufacturers can concisely specify key optical properties of lamps and luminaires with a standardized code that is easily understood worldwide.

  • Industry and Commerce:
    Enables suppliers, retailers, and designers to quickly assess colour rendering and temperature characteristics for product selection and specification.

  • Lighting Design and Engineering:
    Facilitates uniform documentation and communication of lamp characteristics in lighting projects, enhancing consistency in colour quality control.

  • Quality Standards and Compliance:
    Helps regulatory bodies and certification organizations unify testing parameters and reporting formats related to lighting colour properties.

Overall, this shorthand code increases efficiency and reduces misunderstandings related to lighting specifications.

Related Standards

  • IEC 61231:2010 - International lamp coding system (ILCOS)
    Provides the foundational framework and detailed methodologies for coding lamp characteristics, essential for implementing IEC TR 62732 correctly.

  • Colour Rendering Index Standards:
    Other IEC and ISO standards that define and test CRI principles may complement this report for full quality assessment.

  • Standards on Correlated Colour Temperature (CCT):
    Various IEC standards specify measurement procedures and definitions of CCT, which underpin the CCT coding aspect.


For professionals in lighting manufacturing, product development, and specification, IEC TR 62732:2012 offers a practical, internationally recognized tool for streamlined and accurate communication of colour rendering and temperature data. Visit the IEC website for more information and access to the latest editions of this and related standards.

Technical report

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

English language
6 pages
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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 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)
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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
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consensus of opinion on the relevant
...

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