SIST EN IEC 63356-2:2024

SLOVENSKI STANDARD
01-december-2024
Značilnosti LED-svetlobnega vira - 2. del: Parametri za načrtovanje in vrednosti
(IEC 63356-2:2024)
LED light source characteristics - Part 2: Design parameters and values (IEC 63356-
2:2024)
Eigenschaften von LED-Lichtquellen - Teil 2: Konstruktionsparameter und werte (IEC
63356-2:2024)
Caractéristiques de source lumineuse à LED - Partie 2: Paramètres et valeurs de
conception (IEC 63356-2:2024)
Ta slovenski standard je istoveten z: EN IEC 63356-2:2024
ICS:
29.140.99 Drugi standardi v zvezi z Other standards related to
žarnicami lamps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 63356-2

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2024
ICS 29.140.99 Supersedes EN IEC 63356-2:2022
English Version
LED light source characteristics - Part 2: Design parameters and
values
(IEC 63356-2:2024)
Caractéristiques de source lumineuse à LED - Partie 2: Eigenschaften von LED-Lichtquellen - Teil 2:
Paramètres et valeurs de conception Konstruktionsparameter und werte
(IEC 63356-2:2024) (IEC 63356-2:2024)
This European Standard was approved by CENELEC on 2024-10-18. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
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Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63356-2:2024 E

European foreword
The text of document 34A/2405/FDIS, future edition 2 of IEC 63356-2, prepared by SC 34A "Electric
light sources" of IEC/TC 34 "Lighting" was submitted to the IEC-CENELEC parallel vote and approved
by CENELEC as EN IEC 63356-2:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-10-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-10-31
document have to be withdrawn
This document supersedes EN IEC 63356-2:2022 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 63356-2:2024 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 62031:— NOTE Approved as prEN IEC 62031:2024 (not modified)
IEC 63554:— NOTE Approved as prEN IEC 63554:2024 (not modified)
IEC 63555:— NOTE Approved as prEN IEC 63555:2024 (not modified)

Third edition under preparation. Stage at the time of publication: IEC CCDV 62031:2024.
First edition under preparation. Stage at the time of publication: IEC CCDV 63554:2024.
First edition under preparation. Stage at the time of publication: IEC CCDV 63555:2024.
IEC 63356-2 ®
Edition 2.0 2024-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
LED light source characteristics –

Part 2: Design parameters and values

Caractéristiques de source lumineuse à LED –

Partie 2: Paramètres et valeurs de conception

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.99  ISBN 978-2-8322-9618-9

– 2 – IEC 63356-2:2024 © IEC 2024
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Overview and common information . 8
4.1 General . 8
4.2 Numbering system . 8
5 Rectangular LED modules with undefined light emitting surface. 8
5.1 General . 8
5.2 Mechanical references . 8
5.3 LED module categories . 9
5.3.1 General . 9
5.3.2 L6W6 . 9
5.3.3 L14W2 . 10
5.3.4 L28W2 . 11
5.3.5 L28W4 . 12
5.3.6 L28W6 . 13
5.3.7 L28W28 . 14
5.3.8 L38W38 . 16
5.3.9 L56W56 . 19
5.3.10 L56W2 . 21
5.3.11 L56W4 . 21
5.3.12 L112W2 . 22
5.3.13 L115W2 . 25
5.3.14 L140W2 . 27
5.3.15 L145W2 . 29
5.3.16 L30W1 . 31
5.3.17 L58W1 . 32
5.3.18 L115W1 . 33
5.3.19 L145W1 . 34
6 Circular LED modules with a circular light emitting surface for spot lighting . 35
6.1 General . 35
6.2 Mechanical references . 35
6.3 Mechanical interface of the LED module . 37
6.3.1 LED module demarcation . 37
6.3.2 Optics contact area . 38
6.3.3 Requirements on screw holes . 40
6.3.4 LED module electrical interconnect . 40
6.3.5 Luminaire exclusion limits for electrical interconnects . 40
6.3.6 Inner feature . 41
6.3.7 Luminaire mechanical properties . 41
7 LEDni modules with a rectangular shape and a circular light emitting surface . 41
7.1 General . 41
7.2 Mechanical references for an LEDni module . 42
7.3 Mechanical interface of the LEDni module . 43
7.4 LEDni module outlines . 43

IEC 63356-2:2024 © IEC 2024 – 3 –
7.4.1 General . 43
7.4.2 LEDni modules without mounting features . 44
7.4.3 LEDni modules with mounting holes . 45
7.4.4 LEDni modules with recessed corners . 45
7.5 Electrical contact areas . 46
7.5.1 Contact location . 46
7.5.2 Minimum contact size . 46
7.5.3 Contact overlap area . 47
7.5.4 Maximum electrical contact area . 47
7.6 PCB thickness . 48
7.7 Inclusion limit zone . 48
Bibliography . 50

Figure 1 – Example of a luminaire with two LED modules . 8
Figure 2 – Positions of the reference point and the reference plane of the LED module . 9
Figure 3 – LED module demarcation of the L6W6 category . 10
Figure 4 – LED module demarcation of the L14W2 category . 11
Figure 5 – LED module demarcation of the L28W2 category . 12
Figure 6 – LED module demarcation of the L28W4 category . 13
Figure 7 – LED module demarcation of the L28W6 category . 14
Figure 8 – LED module demarcation of the L28W28 category . 16
Figure 9 – LED module demarcation of the L38W38 category . 18
Figure 10 – LED module demarcation of the L56W56 category . 20
Figure 11 – LED module demarcation of the L56W2 category . 21
Figure 12 – LED module demarcation of the L56W4 category . 22
Figure 13 – LED module demarcation of the L112W2 category . 24
Figure 14 – LED module demarcation of the L115W2 category . 26
Figure 15 – LED module demarcation of the L140W2 category . 28
Figure 16 – LED module demarcation of the L145W2 category . 30
Figure 17 – LED module demarcation of the L30W1 category . 31
Figure 18 – LED module demarcation of the L58W1 category . 32
Figure 19 – LED module demarcation of the L115W1 category . 33
Figure 20 – LED module demarcation of the L145W1 category . 34
Figure 21 – Positions of the reference point and reference plane of the LED module . 36
Figure 22 – Positions of the reference point, plane and axis for the LED module
(example for D50 category) . 36
Figure 23 – Drawing of the demarcation of a D35 LED module . 37
Figure 24 – Drawing of the demarcation of the D50 LED module . 38
Figure 25 – Optics contact area of a D35 LED module . 39
Figure 26 – Dimensions of OCAs for a D50 category . 39
Figure 27 – Maximum inner feature outlines . 41
Figure 28 – Positions of the reference point and the reference plane of an LEDni
module . 42
Figure 29 – Definition of the LEDni module border and mechanical references . 43

– 4 – IEC 63356-2:2024 © IEC 2024
Figure 30 – Demarcation model for the outline of an LEDni module without mounting
features . 44
Figure 31 – Demarcation model for the outline of an LEDni module having mounting
holes. 45
Figure 32 – Demarcation model for the outline of an LEDni module having recessed
corners . 46
Figure 33 – Location of the electrical contacts for LEDni modules . 46
Figure 34 – Minimum size contact area for LEDni module electrical contacts . 47
Figure 35 – Overlap area for the electrical contacts of LEDni modules . 47
Figure 36 – Maximum electrical contact area for LEDni modules . 48
Figure 37 – Inclusion limit zone for LEDni module components . 48

Table 1 – LED module demarcation of the L6W6 category . 9
Table 2 – LED module demarcation of the L14W2 category . 11
Table 3 – LED module demarcation of the L28W2 category . 12
Table 4 – LED module demarcation of the L28W4 category . 13
Table 5 – LED module demarcation of the L28W6 category . 14
Table 6 – LED module demarcation of the L28W28 category . 15
Table 7 – LED module demarcation of the L38W38 category . 17
Table 8 – LED module demarcation of the L56W56 category . 19
Table 9 – LED module demarcation of the L56W2 category . 21
Table 10 – LED module demarcation of the L56W4 category . 22
Table 11 – LED module demarcation of the L112W2 category. 23
Table 12 – LED module demarcation of the L115W2 category. 25
Table 13 – LED module demarcation of the L140W2 category. 27
Table 14 – LED module demarcation of the L145W2 category. 29
Table 15 – LES category specifications for circular LED modules for spot lighting . 35
Table 16 – Dimensions of D35 LED module demarcation . 38
Table 17 – Maximum inner OCA diameter . 39
Table 18 – Minimum and maximum OCA heights . 40
Table 19 – Maximum height b of inner feature . 41
Table 20 – Circular LES category specifications for LEDni modules . 42
a
Table 21 – Values of dimensions for LEDni module categories . 44
Table 22 – Inclusion limit zone values of dimension ɸ by LEDni module and
keep-in
LES category . 49

IEC 63356-2:2024 © IEC 2024 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LED LIGHT SOURCE CHARACTERISTICS –

Part 2: Design parameters and values

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,
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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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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 subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC 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, IEC 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 https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 63356-2 has been prepared by subcommittee 34A: Electric light sources, of IEC technical
committee 34: Lighting. It is an International Standard.
This second edition cancels and replaces the first edition published in 2022. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) a new Clause 6 for circular LED modules with a circular light emitting surface for spot
lighting has been added;
b) a new Clause 7 for LEDni modules with a rectangular shape and a circular light emitting
surface has been added.
– 6 – IEC 63356-2:2024 © IEC 2024
The text of this International Standard is based on the following documents:
Draft Report on voting
34A/2405/FDIS 34A/2412/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 63356 series, published under the general title LED light source
characteristics, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

IEC 63356-2:2024 © IEC 2024 – 7 –
LED LIGHT SOURCE CHARACTERISTICS –

Part 2: Design parameters and values

1 Scope
This part of IEC 63356 specifies design parameters and design values of an LED light source
or related interface characteristics.
NOTE 1 Interface characteristics can cover interfaces between the LED light source and the luminaire or the
controlgear, or the LED light source and additional attachments.
NOTE 2 Interfaces can be related to for example electrical, mechanical, or optical aspects.
This document does not cover interchangeability between products from different LED light
source manufacturers.
NOTE 3 Interchangeability is covered by IEC 63356-1.
Lamp caps and lampholders specified in the IEC 60061 series are not within the scope of this
document.
Compliance criteria relating to parameters in this document are covered by:
• IEC 62031:— , LED modules – Safety requirements, or;
• IEC 63554:— , LED lamps – Safety requirements, or;
• IEC 63555:— , LED light sources – Performance requirements.
2 Normative references
There are no normative references in this document.
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:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
thermal interface material
TIM
material with specified thermal conductivity assembled between an LED module and a luminaire
to enable improved heat dissipation
___________
Third edition under preparation. Stage at the time of publication IEC CCDV 62031:2024.
First edition under preparation. Stage at the time of publication IEC CCDV 63554:2024.
First edition under preparation. Stage at the time of publication IEC CCDV 63555:2024.

– 8 – IEC 63356-2:2024 © IEC 2024
4 Overview and common information
4.1 General
Dimensions are specified at a temperature of (25 ± 5) °C, unless otherwise specified.
All values of dimensions that omit an explicit unit indication are in millimetres.
4.2 Numbering system
Products that have comparable interfaces are grouped in separate clauses.
5 Rectangular LED modules with undefined light emitting surface
NOTE Clause 5, including LED module demarcations specified in 5.3.2 through 5.3.19, is taken from Zhaga Book 7
Edition 1.7.
5.1 General
Rectangular LED modules with undefined light emitting surface (LES) are intended to be
mounted in a luminaire. Figure 1 illustrates an example of an LED module-luminaire
combination. In this example the luminaire holds two LED modules. In practice, a luminaire can
hold any number of LED modules.

Figure 1 – Example of a luminaire with two LED modules
The luminaire typically features luminaire-optics which shape the light output of the LED
module(s).
5.2 Mechanical references
The reference plane and the reference point of an LED module, including (optional) TIM are
defined in Figure 2. Dimensions are specified relative to either the reference point or the
reference plane unless indicated otherwise. Moreover, dimensions are specified to include the
thickness of the TIM (if present).

IEC 63356-2:2024 © IEC 2024 – 9 –

Figure 2 – Positions of the reference point and the reference plane of the LED module
5.3 LED module categories
5.3.1 General
Subclause 5.3 specifies a number of LED module categories that are identified by a designation.
The LED module demarcations of these LED module categories are specified in 5.3.2 to 5.3.19.
The intention of the demarcation model is to visualize restricted areas or volumes that no part
of a luminaire should cross. The hashed area indicates limits for the inclusion zone for LED
module design and the exclusion zone for luminaire design.
Unless stated otherwise, all holes are available and for each hole at least 25 % of the
circumference of the hole is present in the LED module. The demarcation model specifies the
minimum diameter of the mounting holes at a specified position.
NOTE In typical designs the diameter of these holes can be larger allowing for a tolerance on the position of the
holes.
If the LED module is applied in combination with a TIM, this material is defined to be part of the
LED module. Thus, the total height of the module and TIM should not exceed the maximum
height H (see 5.3.2 to 5.3.19).
5.3.2 L6W6
The designation for this category is 'L6W6'.
The LED module demarcation of the L6W6 category is defined in Table 1 and Figure 3.
Table 1 – LED module demarcation of the L6W6 category
Dimension Value
L 60
W 60
H 20
a 48
b 48
M 20
P 35
Øc 4,3
– 10 – IEC 63356-2:2024 © IEC 2024

NOTE The top drawing shows the detail X.
Figure 3 – LED module demarcation of the L6W6 category
The X-axis and Y-axis are the symme
...