ISO/CIE 23603

Standard method of assessing the spectral quality of daylight simulators for visual appraisal and measurement of colour

Méthode normalisée d'évaluation de la qualité spectrale des simulateurs de lumière du jour pour le jugement visuel et la mesure des couleurs

General Information

• Status: Not Published
• ICS: 17.180.20 - Colours and measurement of light
• Technical Committee: CIE - International Commission on Illumination
• Drafting Committee: CIE - International Commission on Illumination
• Current Stage: 6000 - International Standard under publication
• Completion Date: 06-Sep-2024

Relations

• Revises: ISO 23603:2005 - Standard method of assessing the spectral quality of daylight simulators for visual appraisal and measurement of colour
• Effective Date: 06-Jun-2022

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/CIE FDIS
CIE
Standard method of assessing
Secretariat: CIE
the spectral quality of daylight
Voting begins on:
simulators for visual appraisal and
2024-07-11
measurement of colour
Voting terminates on:
2024-09-05
Méthode normalisée d'évaluation de la qualité spectrale des
simulateurs de lumière du jour pour le jugement visuel et la
mesure des couleurs
Member bodies are requested to consult relevant national interests in ISO/TC
274 before casting their ballot to the e-Balloting application.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/CIE FDIS 23603:2024(en) © ISO/CIE 2024

FINAL DRAFT
ISO/CIE FDIS 23603:2024(en)
International
Standard
ISO/CIE FDIS
CIE
Standard method of assessing
Secretariat: CIE
the spectral quality of daylight
Voting begins on:
simulators for visual appraisal and
measurement of colour
Voting terminates on:
Méthode normalisée d'évaluation de la qualité spectrale des
simulateurs de lumière du jour pour le jugement visuel et la
mesure des couleurs
Member bodies are requested to consult relevant national interests in ISO/TC
274 before casting their ballot to the e-Balloting application.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
© ISO/CIE 2024
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
IN ADDITION TO THEIR EVALUATION AS
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
or ISO’s member body in the country of the requester
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
ISO copyright office CIE Central Bureau TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ISO/CIE FDIS 23603:2024(en) © ISO/CIE 2024

© ISO/CIE 2024 – All rights reserved
ii
ISO/CIE FDIS 23603:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 4
4.1 Chromaticity tolerance .4
4.2 Quality grade .4
5 Test methods . 4
5.1 Spectroradiometry .4
5.2 Computations .5
5.2.1 Normalization .5
5.2.2 Chromaticity deviation .5
5.2.3 Virtual metameric pairs .5
5.2.4 Computing metamerism indices .5
6 Tables . 7
Bibliography . 19

© ISO/CIE 2024 – All rights reserved
iii
ISO/CIE FDIS 23603:2024(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that this
may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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.
This first edition cancels and replaces the first edition (ISO 23603:2005/CIE S 012:2004), which has been
technically revised.
The main changes are as follows:
— normative references updated;
— terms and definitions updated;
— minor editorial changes.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

© ISO/CIE 2024 – All rights reserved
iv
ISO/CIE FDIS 23603:2024(en)
Introduction
The purpose of the assessment method described in this document is to quantify the suitability of the
spectral irradiance distribution of a practical daylight simulator of CIE daylight illuminant D55, D75 or
CIE standard daylight illuminants D50 and D65 for the visual appraisal and measurement of colours of
fluorescent or non-fluorescent specimens.
The basis for the assessment is the special metamerism index for change in illuminant, using pairs of virtual
(rather than real) specimens specified by their reflecting and fluorescing properties. The pairs of specimens
are metameric matches under the CIE daylight illuminant, when evaluated with the CIE 1964 standard
colorimetric observer. The method described in this document quantifies the mismatch when the pairs of
virtual specimens are illuminated by the daylight simulator under test and evaluated by the same standard
colorimetric observer.
A visible range metamerism index is derived to quantify the suitability of the simulator for the visible
wavelength range.
An ultraviolet range metamerism index is derived using a different set of virtual metameric pairs, each pair
having a fluorescent and a non-fluorescent specimen which spectrally match for the CIE daylight illuminant
and CIE standard colorimetric observer. The non-fluorescent specimen in each pair is specified by its spectral
radiance factor. The fluorescent specimen in each pair is specified by its spectral reflected radiance factor,
relative spectral distribution of radiance due to fluorescence and spectral external radiant efficiency of the
fluorescent specimen. The ultraviolet range metamerism index quantifies the mismatch due to fluorescence
that results from the use of the daylight simulator and the CIE 1964 standard colorimetric observer.

© ISO/CIE 2024 – All rights reserved
v
FINAL DRAFT International Standard ISO/CIE FDIS 23603:2024(en)
Standard method of assessing the spectral quality of daylight
simulators for visual appraisal and measurement of colour
1 Scope
This document specifies a method of assessing the spectral quality of the irradiance provided by a daylight
simulator to be used for visual appraisal of colours or for colour measurements and a method of assigning
a quality grade to the simulator. It specifies the maximum permissible deviation of the chromaticity of the
simulator from the chromaticity of the CIE standard daylight illuminant or CIE daylight illuminant being
simulated for a daylight simulator to be graded by this method.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO/CIE 11664-1, Colorimetry — Part 1: CIE standard colorimetric observers
ISO/CIE 11664-2, Colorimetry — Part 2: CIE standard illuminants
ISO/CIE 11664-4, Colorimetry — Part 4: CIE 1976 L*a*b* colour space
ISO/CIE 11664-5, Colorimetry — Part 5: CIE 1976 L*u*v* Colour Space and u′, v′ Uniform Chromaticity Scale Diagram
CIE 051.2-1999, A Method for Assessing the Quality of Daylight Simulators for Colorimetry
CIE 250:2022, Spectroradiometric measurement of optical radiation sources
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
CIE maintains a terminology database for use in standardization at the following address:
— CIE e-ILV: available at https:// cie .co .at/ e -ilv
3.1
daylight simulator
device for the visual appraisal or measurement of the colour of materials or surfaces that provides spectral
irradiance approximating a CIE standard illuminant representing a phase of daylight
[SOURCE: CIE S 017:2020, Entry 17-23-025]

© ISO/CIE 2024 – All rights reserved
ISO/CIE FDIS 23603:2024(en)
3.2
quality grade
class of quality of simulation of the spectral irradiance of a CIE illuminant by a
simulator, expressed as a letter symbol A, B, C, D or E, with class A representing the highest quality
[SOURCE: CIE S 017:2020, Entry 17-23-024]
3.3
reflectance factor
R
quotient of the flux reflected in the directions delimited by a given cone with apex at a surface element,
Φ , and the flux reflected in the same directions by a perfect reflecting diffuser identically irradiated or
n
illuminated, Φ
d
Φ
n
R=
Φ
d
Note 1 to entry: The definition holds for a surface element, for the part of the reflected radiation contained in a given
cone with apex at the surface element, and for incident radiation of given spectral composition, polarization and
geometric distribution.
Note 2
...

Style Definition
ISO/CIE FDIS 23603:2024(E) .
Formatted: French (Switzerland)
CIE
Formatted: Right: 1.5 cm, Bottom: 1 cm, Gutter: 0 cm,
Section start: New page, Header distance from edge:
Secretariat: CIE
1.27 cm, Footer distance from edge: 1.27 cm
2024-05-24 Formatted
...
Formatted: zzCover large
Formatted: French (Switzerland)
Formatted: French (Switzerland)
Formatted: Space After: 0 pt, Adjust space between
Latin and Asian text, Adjust space between Asian text
and numbers
Standard method of assessing the spectral quality of daylight
Formatted: Cover Title_A1, Adjust space between Latin
simulators for visual appraisal and measurement of colour
and Asian text, Adjust space between Asian text and
numbers
Méthode normalisée d'évaluation de la qualité spectrale des simulateurs de lumière du jour pour le jugement
visuel et la mesure des couleurs
FDIS stage
ISO/CIE FDIS 23603:2024(Een)
Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
© ISO/CIE 2024
Formatted: HeaderCentered, Space After: 0 pt, Line
spacing: single
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, Formatted: No page break before, Adjust space
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either between Latin and Asian text, Adjust space between
Asian text and numbers
CIE or ISO at the addressesaddress below or ISO’s member body in the country of the requester.
Formatted: Default Paragraph Font
ISO copyright office CIE Central Bureau
Formatted: Default Paragraph Font
CP 401 • Ch. de Blandonnet 8 Babenbergerstraße 9/9A
CH-1214 Vernier, Geneva A-1010 Vienna, Austria
Formatted: Adjust space between Latin and Asian text,
Phone: + 41 22 749 01 11 Phone: [phone]
Adjust space between Asian text and numbers
Formatted: zzCopyright address, Adjust space between
Email: [e-mail] Email: [e-mail]
Latin and Asian text, Adjust space between Asian text
and numbers, Tab stops: Not at 7.75 cm
Website: www.iso.org Website: www.cie.co.at
Formatted: French (Switzerland)
E-mail: [e-mail]
Formatted: French (Switzerland)
Website: www.iso.org
Formatted: French (Switzerland)
Published in Switzerland/Austria
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: FooterPageRomanNumber, Space After: 0
pt, Line spacing: single
Formatted: Font: 11 pt
ii © ISO/CIE 2024 – All rights reserved
ii
ISO/CIE FDIS 23603:2024(Een)
Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Formatted: HeaderCentered, Left, Space After: 0 pt,
Contents
Line spacing: single
Formatted: Font: 11 pt, Bold
Foreword . iv
Formatted: Adjust space between Latin and Asian text,
Introduction . v
Adjust space between Asian text and numbers, Tab
stops: Not at 11.45 cm
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements. 4
4.1 Chromaticity tolerance . 4
4.2 Quality grade . 4
5 Test methods . 5
5.1 Spectroradiometry . 5
5.2 Computations . 5
5.2.1 Normalization . 5
5.2.2 Chromaticity deviation . 5
5.2.3 Virtual metameric pairs . 6
5.2.4 Computing metamerism indices . 6
6 Tables . 8
Bibliography . 26
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements. 4
4.1 Chromaticity tolerance . 4
4.2 Quality grade . 4
5 Test methods . 5
5.1 Spectroradiometry . 5
5.2 Computations . 5
5.2.1 Normalization . 5
5.2.2 Chromaticity deviation . 5
5.2.3 Virtual metameric pairs . 6
5.2.4 Computing metamerism indices . 6
6 Tables . 8
Bibliography . 26
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: FooterPageRomanNumber, Space After: 0
pt, Line spacing: single
Formatted: Font: 11 pt
© ISO/CIE 2024 – All rights reserved
iii
ISO/CIE FDIS 23603:2024(Een)
Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Foreword
Formatted: HeaderCentered, Space After: 0 pt, Line
spacing: single
ISO (the International Organization for Standardization) is a worldwide federation of national standards
Formatted: Adjust space between Latin and Asian text,
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
Adjust space between Asian text and numbers
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 document 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).
Formatted: English (United Kingdom)
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO [had/had not] received notice of (a)
Formatted: Font: Not Italic
patent(s) which may be required to implement this document. However, implementers are cautioned that this
may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
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.htmlwww.iso.org/iso/foreword.html.
Formatted: English (United Kingdom)
This document was prepared by the International Commission on Illumination (CIE) in cooperation with
Formatted: Adjust space between Latin and Asian text,
Technical Committee ISO/TC 274, Light and lighting. Adjust space between Asian text and numbers
This first edition cancels and replaces the first edition (ISO 23603:2005/CIE S 012:2004), which has been
Formatted: Default Paragraph Font
technically revised.
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
The main changes are as follows:
Formatted: Don't keep with next, Adjust space
— — normative references updated;
between Latin and Asian text, Adjust space between
Asian text and numbers
— — terms and definitions updated;
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab
— — minor editorial changes.
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: English (United Kingdom)
complete listing of these bodies can be found at www.iso.org/members.htmlwww.iso.org/members.html.
Formatted: English (United Kingdom)
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: FooterPageRomanNumber, Space After: 0
pt, Line spacing: single
Formatted: Font: 11 pt
iv © ISO/CIE 2024 – All rights reserved
iv
ISO/CIE FDIS 23603:2024(Een)
Formatted: Font: 11 pt, Bold
Formatted: HeaderCentered, Left, Space After: 0 pt,
Line spacing: single
Introduction Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
The purpose of the assessment method described in this document is to quantify the suitability of the spectral
Formatted: Adjust space between Latin and Asian text,
irradiance distribution of a practical daylight simulator of CIE daylight illuminant D55, D75 or CIE standard
Adjust space between Asian text and numbers
daylight illuminants D50 and D65 for the visual appraisal and measurement of colours of fluorescent or non-
fluorescent specimens.
The basis for the assessment is the special metamerism index for change in illuminant, using pairs of virtual
(rather than real) specimens specified by their reflecting and fluorescing properties. The pairs of specimens
are metameric matches under the CIE daylight illuminant, when evaluated with the CIE 1964 standard
Formatted: Default Paragraph Font
colorimetric observer. The method described in this document quantifies the mismatch when the pairs of
Formatted: Default Paragraph Font
virtual specimens are illuminated by the daylight simulator under test and evaluated by the same standard
colorimetric observer.
A visible range metamerism index is derived to quantify the suitability of the simulator for the visible
wavelength range.
An ultraviolet range metamerism index is derived using a different set of virtual metameric pairs, each pair
having a fluorescent and a non-fluorescent specimen which spectrally match for the CIE daylight illuminant
and CIE standard colorimetric observer. The non-fluorescent specimen in each pair is specified by its spectral
radiance factor. The fluorescent specimen in each pair is specified by its spectral reflected radiance factor,
relative spectral distribution of radiance due to fluorescence and spectral external radiant efficiency of the
fluorescent spec
...