EN ISO/CIE 11664-2:2022

Colorimetry - Part 2: CIE standard illuminants (ISO/CIE 11664-2:2022)

This document defines three CIE standard illuminants for use in colorimetry: CIE standard illuminant A for the representation of typical tungsten-filament lighting, CIE standard illuminant D65 for the representation of average daylight having a correlated colour temperature of approximately 6 500 K and CIE standard illuminant D50 for the representation of daylight with a correlated colour temperature of approximately 5 000 K. Values of the relative spectral power distribution of the three illuminants are included in this document.

Farbmetrik - Teil 2: CIE Normlichtarten (ISO/CIE 11664-2:2022)

Dieses Dokument definiert drei CIE Normlichtarten zur Anwendung in der Farbmetrik: CIE Normlichtart A für die Repräsentation einer typischen Beleuchtung mit Wolfram-Glühfaden, CIE Normlichtart D65 für die Repräsentation von durchschnittlichem Tageslicht mit einer korrelierten Farbtemperatur von etwa 6 500 K und CIE Normlichtart D50 für die Repräsentation von Tageslicht mit einer korrelierten Farbtemperatur von etwa 5 000 K. Dieses Dokument enthält Werte für die Strahlungsfunktion der drei Lichtarten.

Colorimétrie - Partie 2: Illuminants CIE normalisés (ISO/CIE 11664-2:2022)

Le présent document définit trois illuminants normalisés de la CIE à utiliser en colorimétrie: l’illuminant normalisé A de la CIE représentatif de l’éclairage à incandescence avec filament de tungstène, l’illuminant normalisé D65 de la CIE représentatif d’une lumière du jour moyenne ayant une température de couleur proximale d’environ 6 500 K, et l’illuminant normalisé D50 de la CIE représentatif d’une lumière du jour ayant une température de couleur proximale d’environ 5 000 K. Des valeurs de la répartition spectrale relative d’énergie des trois illuminants sont incluses dans le présent document.

Kolorimetrija - 2. del: Standardizirana osvetljevala (iluminanti) CIE (ISO/CIE 11664-2:2022)

General Information

• Status: Published
• Publication Date: 27-Sep-2022
• ICS: 17.180.20 - Colours and measurement of light
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 28-Sep-2022
• Completion Date: 28-Sep-2022
• Ref Project: SIST EN ISO/CIE 11664-2:2022 - Colorimetry - Part 2: CIE standard illuminants (ISO/CIE 11664-2:2022)

Relations

• Replaces: EN ISO 11664-2:2011 - Colorimetry - Part 2: CIE standard illuminants (ISO 11664-2:2007)
• Effective Date: 05-Oct-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2022
Nadomešča:
SIST EN ISO 11664-2:2011
Kolorimetrija - 2. del: Standardizirana osvetljevala (iluminanti) CIE (ISO/CIE 11664-
2:2022)
Colorimetry - Part 2: CIE standard illuminants (ISO/CIE 11664-2:2022)
Farbmetrik - Teil 2: CIE Normlichtarten (ISO/CIE 11664-2:2022)
Colorimétrie - Partie 2: Illuminants CIE normalisés (ISO/CIE 11664-2:2022)
Ta slovenski standard je istoveten z: EN ISO/CIE 11664-2:2022
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO/CIE 11664-2
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2022
EUROPÄISCHE NORM
ICS 17.180.20 Supersedes EN ISO 11664-2:2011
English Version
Colorimetry - Part 2: CIE standard illuminants (ISO/CIE
11664-2:2022)
Colorimétrie - Partie 2: Illuminants CIE normalisés Farbmetrik - Teil 2: CIE Normlichtarten (ISO/CIE
(ISO/CIE 11664-2:2022) 11664-2:2022)
This European Standard was approved by CEN on 2 August 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO/CIE 11664-2:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO/CIE 11664-2:2022) has been prepared by Technical Committee CIE
"International Commission on Illumination" in collaboration with Technical Committee CEN/TC 139
“Paints and varnishes” the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2023, and conflicting national standards shall
be withdrawn at the latest by March 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11664-2:2011.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO/CIE 11664-2:2022 has been approved by CEN as EN ISO/CIE 11664-2:2022 without any
modification.
INTERNATIONAL ISO/CIE
STANDARD 11664-2
First edition
2022-08
Colorimetry —
Part 2:
CIE standard illuminants
Colorimétrie —
Partie 2: Illuminants CIE normalisés
Reference number
ISO/CIE 11664-2:2022(E)
© ISO/CIE 2022
ISO/CIE 11664-2:2022(E)
© ISO/CIE 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester
ISO copyright office CIE Central Bureau
CP 401 • Ch. de Blandonnet 8 Babenbergerstraße 9/9A • A-1010 Vienna
CH-1214 Vernier, Geneva
Phone: [phone] Phone: [phone]
Fax: [phone]
Email: [e-mail] Email: [e-mail]
Website: www.iso.org Website: www.cie.co.at
Published in Switzerland
ii
© ISO/CIE 2022 – All rights reserved

ISO/CIE 11664-2:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 S c op e . 1
2 Nor m at i ve r ef er enc e s . 1
3 Terms and definitions . 1
4 CIE standard illuminant A . 2
4.1 Definition . 2
4 . 2 T he or e t ic a l b a s i s . 2
5 CIE standard illuminant D65 .3
5.1 D efinition . 3
5.2 E xperimental basis . 3
5.3 C orrelated colour temperature . 3
6 CIE standard illuminant D50 . 3
6.1 Definition . 3
6.2 C orrelated colour temperature . 3
7 S ources for realizing CIE standard illuminants . 4
7.1 S ource for CIE standard illuminant A . 4
7.2 S ources for CIE standard illuminants D65 and D50 . 4
Annex A (informative) Table of relative spectral power distribution of CIE standard
illuminant A . 5
Annex B (normative) Table of relative spectral power distributions of CIE standard
illuminants D65 and D50 .18
Annex C (informative) History of the definition of CIE standard illuminant A .31
Bibliography .32
iii
© ISO/CIE 2022 – All rights reserved

ISO/CIE 11664-2:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by the International Commission on Illumination (CIE) in cooperation
with Technical Committee ISO/TC 274, Light and lighting, in collaboration with the European Committee
for Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This first edition cancels and replaces ISO 11664-2:2007/CIE S 014-2:2006, which has been technically
revised.
The main changes are as follows:
— CIE illuminant D50 has been included as CIE standard illuminant because of its extensive use in the
fields of graphic, arts and photography.
A list of all parts in the ISO/CIE 11664 series can be found on the CIE and ISO websites.
Any feedback or questions on this document should be directed to the CIE Central Bureau or the user’s
national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.
iv
© ISO/CIE 2022 – All rights reserved

ISO/CIE 11664-2:2022(E)
Introduction
The illuminants defined in this document are as follows:
a) CIE standard illuminant A
CIE standard illuminant A is intended to represent typical tungsten-filament lighting. Its relative
spectral power distribution is that of a Planckian radiator at a temperature of approximately 2 855,5 K.
CIE standard illuminant A should be used in all applications of colorimetry involving the use of
incandescent lighting, unless there are specific reasons for using a different illuminant. CIE standard
illuminant A is used in photometry as primary reference spectrum for the calibration of photometric
devices.
b) CIE standard illuminant D65
CIE standard illuminant D65 is intended to represent average daylight having a correlated colour
temperature of approximately 6 500 K. CIE standard illuminant D65 should be used in all colorimetric
calculations requiring representative outdoor daylight, unless there are specific reasons for using a
different spectral power distribution. Variations in th
...