IEC 63356-2:2024

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
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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

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

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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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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.

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).

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 symmetry axes for the outline and the mounting holes.
5.3.3 L14W2
The designation for this category is 'L14W2'.
The LED module demarcation of the L14W2 category is defined in Table 2 and Figure 4.

Table 2 – LED module demarcation of the L14W2 category
Dimension Value
L 140
W 24
H 20
a 110
b 18,4
d 15
Øc 4,3
NOTE The top drawing shows the detail X.
Figure 4 – LED module demarcation of the L14W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the crosshair lines of the
mounting holes.
5.3.4 L28W2
The designation for this category is 'L28W2'.
The LED module demarcation of the L28W2 category is defined in Table 3 and Figure 5. The
two mounting holes at the bottom of the diagram of Figure 5 are optional.

– 12 – IEC 63356-2:2024 © IEC 2024
Table 3 – LED module demarcation of the L28W2 category
Dimension Value
L 280
W 24
H 20
a 125
b 18,4
Øc 4,3
NOTE The top drawing shows the detail X.
Figure 5 – LED module demarcation of the L28W2 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and mounting holes.
5.3.5 L28W4
The designation for this category is 'L28W4'.
The LED module demarcation of the L28W4 category is defined in Table 4 and Figure 6.

Table 4 – LED module demarcation of the L28W4 category
Dimension Value
L 281
W 41
H 20
a 110
b 31
Øc 4,3
NOTE The top drawing shows the detail X.
Figure 6 – LED module demarcation of the L28W4 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and mounting holes.
5.3.6 L28W6
The designation for this category is 'L28W6'.
The LED module demarcation of the L28W6 category is defined in Table 5 and Figure 7.

– 14 – IEC 63356-2:2024 © IEC 2024
Table 5 – LED module demarcation of the L28W6 category
Dimension Value
L 281
W 61
H 20
a 91
b 40
Øc 4,3
d 11
e 15
NOTE The top drawing shows the detail X.
Figure 7 – LED module demarcation of the L28W6 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and the leftmost and rightmost mounting holes.
5.3.7 L28W28
The designation for this category is 'L28W28'.
The LED module demarcation of the L28W28 category is defined in Table 6 and Figure 8.

Table 6 – LED module demarcation of the L28W28 category
Dimension Value
L 281
W 281
H 20
a 222
b 180
Øc 4,3
– 16 – IEC 63356-2:2024 © IEC 2024

NOTE The top drawing shows the detail X.
Figure 8 – LED module demarcation of the L28W28 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.
5.3.8 L38W38
The designation for this category is 'L38W38'.
The LED module demarcation of the L38W38 category is defined in Table 7 and Figure 9.

Mounting holes not being in the corners of the LED module are optional.
Table 7 – LED module demarcation of the L38W38 category
Dimension Value
L 381
W 381
H 20
a 371,9
a1 21,3
b 67,2
Øc 4,3
– 18 – IEC 63356-2:2024 © IEC 2024

NOTE The top drawing shows the detail X.
Figure 9 – LED module demarcation of the L38W38 category
The X-axis is the symmetry axis for the outline and the mounting holes.
The Y-axis is the symmetry axis for the outline and the crosshair lines of mounting holes.

5.3.9 L56W56
The designation for this category is 'L56W56'.
The LED module demarcation of the L56W56 category is defined in Table 8 and Figure 10.
Table 8 – LED module demarcation of the L56W56 category
Dimension Value
L 562
W 562
H 20
a 503
b 461
Øc 4,3
– 20 – IEC 63356-2:2024 © IEC 2024

NOTE The top drawing shows the detail X.
Figure 10 – LED module demarcation of the L56W56 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.10 L56W2
The designation for this category is 'L56W2'.
The LED module demarcation of the L56W2 category is defined in Table 9 and Figure 11. The
four mounting holes at the bottom of the diagram of Figure 11 are optional.
Table 9 – LED module demarcation of the L56W2 category
Dimension Value
L 560
W 24
H 20
a 125
b 18,4
d 30
Øc 4,3
NOTE The top drawing shows the detail X.
Figure 11 – LED module demarcation of the L56W2 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and mounting holes.
5.3.11 L56W4
The designation for this category is 'L56W4'.
The LED module demarcation of the L56W4 category is defined in Table 10 and Figure 12.

– 22 – IEC 63356-2:2024 © IEC 2024
Table 10 – LED module demarcation of the L56W4 category
Dimension Value
L 561
W 41
H 20
a 110
b 31
Øc 4,3
d 61
NOTE The top drawing shows the detail X.
Figure 12 – LED module demarcation of the L56W4 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and mounting holes.
5.3.12 L112W2
The designation for this category is 'L112W2'.
The LED module demarcation of the L112W2 category is defined in Table 11 and Figure 13.

Table 11 – LED module demarcation of the L112W2 category
Dimension Value
L 1 120
W 24
H 20
a 125
b 18,4
Øc 4,3
d 30
e 155
– 24 – IEC 63356-2:2024 © IEC 2024

NOTE The drawing on the left shows the detail X.
Figure 13 – LED module demarcation of the L112W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.13 L115W2
The designation for this category is 'L115W2'.
The LED module demarcation of the L115W2 category is defined in Table 12 and Figure 14.
Table 12 – LED module demarcation of the L115W2 category
Dimension Value
L 1 150
W 24
H 20
a 125
b 18,4
Øc 4,3
d 30
e 155
– 26 – IEC 63356-2:2024 © IEC 2024

NOTE The drawing on the left shows the detail X.
Figure 14 – LED module demarcation of the L115W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.14 L140W2
The designation for this category is 'L140W2'.
The LED module demarcation of the L140W2 category is defined in Table 13 and Figure 15.
Table 13 – LED module demarcation of the L140W2 category
Dimension Value
L 1 400
W 24
H 20
a 125
b 18,4
Øc 4,3
d 30
e 155
– 28 – IEC 63356-2:2024 © IEC 2024

NOTE The drawing on the left shows the detail X.
Figure 15 – LED module demarcation of the L140W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.15 L145W2
The designation for this category is 'L145W2'.
The LED module demarcation of the L145W2 category is defined in Table 14 and Figure 16.
Table 14 – LED module demarcation of the L145W2 category
Dimension Value
L 1 450
W 24
H 20
a 125
b 18,4
Øc 4,3
d 30
e 155
– 30 – IEC 63356-2:2024 © IEC 2024

NOTE The drawing on the left shows the detail X.
Figure 16 – LED module demarcation of the L145W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.16 L30W1
The designation for this category is 'L30W1'.
The LED module demarcation of the L30W1 category is defined in Figure 17.

Figure 17 – LED module demarcation of the L30W1 category
The X-axis and Y-axis are the symmetry axes for the outline.

– 32 – IEC 63356-2:2024 © IEC 2024
5.3.17 L58W1
The designation for this category is 'L58W1'.
The LED module demarcation of the L58W1 category is defined in Figure 18.

NOTE The X-axis is not to scale.
Figure 18 – LED module demarcation of the L58W1 category
The X-axis and Y-axis are the symmetry axes for the outline.

5.3.18 L115W1
The designation for this category is 'L115W1'.
The LED module demarcation of the L115W1 category is defined in Figure 19.

NOTE The X-axis is not to scale.
Figure 19 – LED module demarcation of the L115W1 category
The X-axis and Y-axis are the symmetry axes for the outline.

– 34 – IEC 63356-2:2024 © IEC 2024
5.3.19 L145W1
The designation for this category is 'L145W1'.
The LED module demarcation of the L145W1 category is defined in Figure 20.

NOTE The X-axis is not to scale.
Figure 20 – LED module demarcation of the L145W1 category
The X-axis and Y-axis are the symmetry axes for the outline.

6 Circular LED modules with a circular light emitting surface for spot lighting
NOTE Clause 6 is taken from Zhaga Book 10 Edition 1.2.
6.1 General
LED modules with a circular light emitting surface (LES) and having high luminance typically
used in spot lighting applications are intended to be fixed to a luminaire heat sink by means of
screws. The LED modules specified in this Clause 6 comprise a single inseparable unit and are
intended to be installed and replaced by skilled persons only.
The circular LES diameter specifications are given in Table 15 for each LES designation. The
light output distribution is primarily Lambertian, to enable luminaire optics to shape an
application-specific light distribution independent to that of the LED module. Clause 6 specifies
LED modules having either a 35 mm (D35) or 50 mm (D50) outer diameter and five different
LES diameters categorized as LES6.3, LES9, LES13.5, LES19 or LES23. The complete
designation of these LED modules comprises both the outer diameter and the LES category
designation (e.g. D35-LES6.3).
Table 15 – LES category specifications for circular LED modules for spot lighting
LES category designation LES diameter
mm
LES6.3 4,5 < Ø ≤ 6,3
LES9 6,3 < Ø ≤ 9,0
LES13.5 9,0 < Ø ≤ 13,5
LES19 13,5 < Ø ≤ 19,0
LES23 19,0 < Ø ≤ 23,0
6.2 Mechanical references
The reference plane and the reference point of an LED module with respect to (optional) TIM
are specified in Figure 21 and illustrated in Figure 22 for a D50 (50 mm outer diameter) LED
module. Dimensions are specified relative to either the reference point or reference plane,
unless indicated otherwise. Moreover, dimensions are specified with TIM (if present) in
compressed state.
– 36 – IEC 63356-2:2024 © IEC 2024

Figure 21 – Positions of the reference point and reference plane of the LED module

Figure 22 – Positions of the reference point, plane and axis
for the LED module (example for D50 category)

6.3 Mechanical interface of the LED module
6.3.1 LED module demarcation
6.3.1.1 General
The LED module demarcations are specified in 6.3.1.2 and 6.3.1.3.
No part of the LED module (excluding the interconnect) crosses the boundaries of the LED
module demarcation and no part of the luminaire (excluding the interconnect) crosses the
boundaries of the LED module demarcation. The demarcation models include positions and
shape for screw hole clearances.
If the LED module is applied in combination with a thermal interface material, this TIM is
considered to be part of the LED module. Thus, the total height of the LED module and of the
TIM (while compressed according to instructions from the LED module manufacturer) does not
exceed the maximum height specified in 6.3.1.2, Figure 23, dimension H (D35 category) or
6.3.1.3, Figure 24 (D50 category).
6.3.1.2 D35 LED module demarcation
D35 LED modules have a demarcation according to the drawing in Figure 23
...