General lighting - Light emitting diode (LED) products and related equipment - Terms and definitions

IEC 62504:2014 is of assistance in the common understanding of terms and definitions, relevant for general lighting with LED technology. The terms included are those already available in IEC LED standards or used in manufacturers' literature. This standard provides descriptive terms (like "LED light sources") and measurable terms when modified from IEC 60050-845 (like "colour rendering index"). This first edition cancels and replaces the IEC TS 62504 published in 2011. The significant changes with respect to IEC TS 62504 are as follows:
a) Terms from the International Electrotechnical Vocabulary that have not been modified are deleted;
b) Alignment with the CIE has been done;
c) An introduction has been added.

Eclairage général - Produits à diode électroluminescente (DEL) et équipements associés - Termes et définitions

L'IEC 62504:2014 doit aider à une compréhension partagée des termes et des définitions pertinents concernant l'éclairage général avec la technologie à LED. Les termes inclus sont ceux qui sont déjà disponibles dans les normes IEC relatives aux LED ou utilisés dans les ouvrages de référence des fabricants. La présente norme donne des termes descriptifs (comme "sources lumineuses à LED") et des termes mesurables modifiés par rapport à l'IEC 60050-845 (comme "indice général de rendu des couleurs"). Cette première édition annule et remplace l'IEC TS 62504 parue en 2011. Les améliorations importantes par rapport à l'IEC TS 62504 sont comme suit:
a) Les termes du Vocabulaire International Electrotechnique qui n'ont pas été modifiés ont été supprimés;
b) L'alignement avec la CIE a été réalisé;
c) Une introduction a été ajoutée.

General Information

Status
Published
Publication Date
18-Jun-2014
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
19-Jun-2014
Completion Date
19-Jun-2014
Ref Project

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IEC 62504
Edition 1.0 2014-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
General lighting – Light emitting diode (LED) products and related equipment –
Terms and definitions
Éclairage général – Produits à diode électroluminescente (LED) et équipements
associés – Termes et définitions
IEC 62504:2014-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62504
Edition 1.0 2014-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
General lighting – Light emitting diode (LED) products and related equipment –
Terms and definitions
Éclairage général – Produits à diode électroluminescente (LED) et équipements
associés – Termes et définitions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 29.140.20 ISBN 978-2-8322-1651-4

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62504:2014 © IEC 2014
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

Annex A (informative) Overview of LED products and terms under consideration ................. 18

A.1 Overview of LED packages ................................................................................... 18

A.2 Overview of systems composed of LED light sources and LED controlgear ........... 19

A.3 Overview of LED light sources .............................................................................. 20

A.3.1 Examples of retrofit LED lamps – White or coloured light, bulb or
reflector type, with caps according IEC 60061 (as shown in Figures A.3

and A.4) ........................................................................................................ 20

A.3.2 Examples of LED lamps with new shapes ...................................................... 20

A.3.3 Examples of LED modules ............................................................................. 20

A.4 Terms under consideration .................................................................................... 21

A.4.1 LED light engine ............................................................................................ 21

A.4.2 Chip on board (CoB) ...................................................................................... 21

A.5 Schematic of built-in, independent, integral LED module ....................................... 22

A.6 LED product tree overview .................................................................................... 22

Bibliography .......................................................................................................................... 24

Figure 1 – Schematic drawing of the chain of thermal resistors ............................................. 17

Figure A.1 – Overview of LED packages ............................................................................... 18

Figure A.2 – Overview of systems composed of LED light sources and LED controlgear ....... 19

Figure A.3 – Examples of retrofit LED lamps ......................................................................... 20

Figure A.4 – Examples of LED lamps with new shapes ......................................................... 20

Figure A.5 – Examples of LEDni modules ............................................................................. 21

Figure A.6 – Examples of chip on board ................................................................................ 22

Figure A.7 – Schematic of built in, independent, integral modules ......................................... 22

Figure A.8 – LED product tree overview ................................................................................ 23

---------------------- Page: 4 ----------------------
IEC 62504:2014 © IEC 2014 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GENERAL LIGHTING – LIGHT EMITTING DIODE (LED) PRODUCTS
AND RELATED EQUIPMENT – TERMS AND DEFINITIONS
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, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising 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

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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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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

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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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62504 has been prepared by IEC technical committee 34: Lamps

and related equipment in collaboration with representatives from CIE.
This first edition cancels and replaces the IEC TS 62504 published in 2011.
The significant changes with respect to IEC TS 62504 are as follows:

a) Terms from the International Electrotechnical Vocabulary that have not been modified are

deleted.
b) Alignment with the CIE has been done.
c) An introduction has been added
---------------------- Page: 5 ----------------------
– 4 – IEC 62504:2014 © IEC 2014
The text of this standard is based on the following documents:
FDIS Report on voting
34/200/FDIS 34/205/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.
---------------------- Page: 6 ----------------------
IEC 62504:2014 © IEC 2014 – 5 –
INTRODUCTION
0.1 Principles of this International Standard

This document is based on IEC TS 62504:2011, General Lighting – LEDs and LED modules –

Terms and definitions, which was under the responsibility of SC 34A but this revision as

International Standard IEC 62504 transfers responsibility to TC 34.

The objective of this introduction is to help the reader to understand which terms are included

and to have an understanding of the LED product overview.
Compared with IEC TS 62504, the main changes are as follows.
0.2 Terms to include

General lighting terms in IEC 60050-845:1987, International Electrotechnical Vocabulary that

have not been modified will not be included in this standard.

Alignment with CIE is done. IEC will be the reference for products and related equipment and

CIE for lighting terminology. Alignment with ANSI RP16-10, Chapter 6.8 was also considered.

The terms included are as far as possible used in LED standards and manufacturers'

literature.,

Process to update IEC 60050-845:1987, the International Electrotechnical Vocabulary for

definitions that will be considered as relevant is underway in IEC TC34.
0.3 Alphabetic sequence

In order to find the term in a logical sequence, we have grouped similar terms of a product,

example:
LED lamp
– integrated LED lamp ,
– non-integrated LED lamp .
For each term, reference is made to the relevant standard if appropriate.
0.4 LED product tree:

The sequence from the first component, the LED die up to the LED luminaire is drawn.

The term LED does not represent a product, so no technical data can be linked to the term

LED.
---------------------- Page: 7 ----------------------
– 6 – IEC 62504:2014 © IEC 2014
GENERAL LIGHTING – LIGHT EMITTING DIODE (LED) PRODUCTS
AND RELATED EQUIPMENT – TERMS AND DEFINITIONS
1 Scope

This International Standard IEC 62504 is of assistance in the common understanding of terms

and definitions, relevant for general lighting with LED technology. The terms included are

those already available in IEC LED standards or used in manufacturers' literature.

This standard provides descriptive terms (like “LED light sources”) and measurable terms

when modified from IEC 60050-845 (like “colour rendering index”).

NOTE Annex A gives overviews of LED package design and systems composed of LED light sources and

controlgear.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050 (all parts), International Electrotechnical Vocabulary (available at
).
CIE Technical Report 127:2007, Measurement of LEDs
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-845, with the

exception of those modified below, and the following apply.
3.1
ageing
preconditioning period of the LED light source before initial values are taken
3.2
angular subtense
angle subtended by an apparent source as viewed from a point in space
Note 1 to entry: Angular subtense is expressed in radians (rad).

Note 2 to entry: The angle extension is determined by the observation distance, but at no distance smaller than

the minimum distance of accommodation of the eye.

Note 3 to entry: The location and angular subtense of the apparent source depends on the viewing position in the

beam.

Note 4 to entry: The angular subtense of an apparent source is only applicable in the wavelength range from

380 nm to1 400 nm.

Note 5 to entry: IEC TR 62778 gives additional information with regards to beam divergence.

---------------------- Page: 8 ----------------------
IEC 62504:2014 © IEC 2014 – 7 –

[SOURCE: IEC 60825-1, 3.7, modified – Notes 1, 2 and 5 to entry are added and in the note 4

to entry the value of the wavelength range has been changed from '400 nm to 1 400 nm' to

'380 nm to 1 400 nm'; IEC 62471, 3.2, modified.]
3.3
apparent source

for a given evaluation location of the retinal hazard, the real or virtual object that forms the

smallest possible retinal image (considering the accommodation range of the human eye)

Note 1 to entry: The accommodation range of the eye is assumed to be variable from 100 mm to infinity. The

location of the apparent source for a given viewing position in the beam is that location to which the eye

accommodates to produce the most hazardous retinal irradiance condition.

Note 2 to entry: This definition is used to determine, for a given evaluation position, the location of the apparent

origin of laser radiation in the wavelength range of 380 nm to 1 400 nm. In the limit of vanishing divergence, i.e. in

the case of a well collimated beam, the location of the apparent source goes to infinity.

[SOURCE: IEC 60825-1, 3.10, modified – In the note 2 to entry the value of the wavelength

range is changed from '400 nm to 1 400 nm' to '380 nm to 1 400 nm'.]
3.4
beam angle

angle between two imaginary lines in a plane through the optical beam axis, such that these

lines pass through the centre of the front face of the lamp and through points at which the

luminous intensity is 50 % of the centre beam intensity
Note 1 to entry: Beam angle is expressed in degrees ( ° ).
Note 2 to entry: This angle is a full angle measure, not a half angle measure.
[SOURCE: IEC TR 61341, 2.4, modified, – The notes to entry are added.]
3.5
bin

restricted range of LED performance characteristics used to delimit a subset of LED dies or

LED packages near a nominal LED performance as identified by chromaticity, photometric,

radiometric and/or electrical characteristics
3.6 controlgear
3.6.1
controlgear for LED module
LED controlgear

unit inserted between the electrical supply and one or more LED modules, which serves to

supply the LED module(s) with its (their) rated voltage or rated current, and may consist of

one or more separate components and may include means for dimming, correcting the power

factor and suppressing radio interference, and further control functions
Note 1 to entry: The controlgear consists of a power supply and a control unit.

Note 2 to entry: The controlgear may be partly or totally integrated in the LED module.

Note 3 to entry: When no confusion is expected like when used in a LED standard for example, “controlgear” may

also be used. Both terms “controlgear” or “control gear” are acceptable.

[SOURCE: IEC 61347-2-13, 3.1, modified – The word 'electronic' is deleted from the term and

the words “further control functions” and the notes to entry are added.]
3.6.2
power supply of the controlgear

electronic device, being part of the controlgear, capable of controlling current, voltage or

power within design limits, containing no additional LED control capabilities
---------------------- Page: 9 ----------------------
– 8 – IEC 62504:2014 © IEC 2014

Note 1 to entry: For LEDsi modules, the power supply of the controlgear is separate from the LED module on a

distant location.

Note 2 to entry: The energy source of a power supply can be either a battery or the electrical supply system.

3.6.3
control unit of the controlgear

electronic device, being part of the controlgear, responsible for controlling the electrical

energy to the LED light sources as well as colour mixing, response to depreciating luminous

flux and further performance features

Note 1 to entry: In LEDsi modules, the control unit of the controlgear is on board of the LED module and separate

from the power supply of the controlgear.
3.7
dominant wavelength

wavelength of the monochromatic stimulus that, when additively mixed in suitable proportions

with the specified achromatic stimulus, matches the colour stimulus considered in the

CIE 1931 x,y chromaticity diagram
Note 1 to entry: Dominant wavelength is expressed in nanometres (nm).

Note 2 to entry: In the case of purple stimuli, the dominant wavelength is replaced by the complementary

wavelength.

Note 3 to entry: For characterising LED light sources the reference achromatic stimulus should be illuminant E

which has the chromaticity coordinates x = 0,3333, y = 0,3333.
E E

Note 4 to entry: A value for dominant wavelength should only be stated for LED light sources emitting coloured

light. For LED light sources emitting white light no meaningful value for dominant wavelength can be given.

Note 5 to entry: Figure 12 in CIE 127:2007 shows the relationship between chromaticity coordinate C of LED light

sources and value of dominant wavelength D. N is the chromaticity coordinate of achromatic stimulus E.

Note 6 to entry: Deviating from the peak wavelength, the dominant wavelength determines perceived colour.

[SOURCE: IEC 60050-845:1987, 845.03.44, modified – The words 'in the CIE 1931 x,y

chromaticity diagram' and the notes to entry 3 to 6 have been added; CIE S 017/E:2011, 17-

345, modified – The notes to entry 3 to 6 have been added.]
3.8
failure
termination of the ability of an item to perform a required function
Note 1 to entry: After failure the item has a fault.

Note 2 to entry: "Failure" is an event, as distinguished from "fault", which is a state.

Note 3 to entry: This concept as defined does not apply to items consisting of software only.

[SOURCE: IEC 60050-191, 191.04.01]
3.9
failure fraction

fraction of the population that lost the ability to perform a required function in a specified time

interval
Note 1 to entry: Failure fraction is dimensionless.
3.10
failure fraction at rated life

ratio y of failed LED products of the same type at their rated life to the test quantity

---------------------- Page: 10 ----------------------
IEC 62504:2014 © IEC 2014 – 9 –
Note 1 to entry: The ratio is expressed in percent.

Note 2 to entry: This failure fraction expresses the combined effect of all components of a LED product including

mechanical, as far as the light output is concerned. The effect of the LED could either be less light than claimed or

no light at all.

Note 3 to entry: For LED products normally a failure fraction of 10% or/and 50% are being applied, indicated as

F and/or F .
10 50
3.11
family

group of LED light sources or LED luminaires, having the same characteristics and method of

control (integrated, semi-integrated, non integrated), the groups are distinguished by common

features of materials, components, and/or method of processing
3.12
forward direction

direction of current that results when the P-type semiconductor region connected to one

terminal is at positive potential relative to the N-type region connected to the other terminal

Note 1 to entry: If temperature compensation diodes are included, these are ignored in the determination of

forward direction.

[SOURCE: IEC 60050-521, 521.05.03, modified – The words 'connected to one terminal',

'potential' and 'connected to the other terminal' as well as note 1 to entry have been added.]

3.13
forward voltage

potential difference pertaining to the forward direction, dependent on the forward current at a

given temperature
Note 1 to entry: Forward voltage is expressed in Volts (V).

Note 2 to entry: Forward voltage for LED die is measured normally at 25 °C ambient temperature.

3.14
heat output to the luminaire

power to be transferred to the luminaire by means of heat-conduction in order to stay below

the t or t temperature
c p
Note 1 to entry: Heat output is expressed in Watts (W).
Note 2 to entry: P is below the rated power of a LED module.

Note 3 to entry: For LED modules which do not need heat-conduction to the luminaire for keeping t , P is equal

c d
to zero.
Note 4 to entry: A measurement method is under consideration.
3.15 LED lamp

LED light source provided with (a) cap(s) incorporating one or more LED module(s) and

possibly including one or more of the following; electrical, optical, mechanical, and thermal

components, interfaces and controlgear

Note 1 to entry: A LED lamp may be integrated (LEDi lamp) or semi-integrated (LEDsi lamp) or non-integrated

(LEDni lamp).
Note 2 to entry: Single and double-capped lamps are included.

Note 3 to entry: A LED lamp is designed so that it can be replaced by an ordinary person (as defined in

IEC 60050-826, 826.18.03).
---------------------- Page: 11 ----------------------
– 10 – IEC 62504:2014 © IEC 2014
3.15.1
integrated LED lamp
LEDi lamp

LED lamp, incorporating controlgear, and any additional elements necessary for stable

operation of the light source, designed for direct connection to the supply voltage

3.15.2
non-integrated LED lamp
LEDni lamp
LED lamp which needs a separate controlgear to operate
3.15.3
retrofit LED lamp
LED lamp intended as a replacement of a non-LED lamp without requiring internal
modification of the luminaire
3.15.4
semi-integrated LED lamp
LEDsi lamp

LED lamp which carries the control unit of the controlgear, and is operated by the separated

power supply of the controlgear
3.16
LED light source
electrical light source based on LED technology

Note 1 to entry: A luminaire may include LED light sources but is not considered itself as a light source.

Note 2 to entry: LED light source(s) for a LED luminaire represents one or more LED lamp(s) or LED module(s).

3.17
LED luminaire
luminaire designed to incorporate one or more LED light source(s)
3.18
non-repairable, factory-sealed LED luminaire,

luminaire which cannot be dismantled without being permanently damaged, and incorporating

LED light source(s) and any additional elements necessary for starting and stable operation of

the light source
3.19 LED module

LED light source having no cap, incorporating one or more LED package(s) on a printed

circuit board, and possibly including one or more of the following: electrical, optical,

mechanical, and thermal components, interfaces and controlgear

Note 1 to entry: A LED module may be integrated (LEDi module, Type 1) or semi-integrated (LEDsi module,

Type 2) or non-integrated (LEDni module, Type 3).

Note 2 to entry: The LED module is usually designed to be part of a LED lamp or LED luminaire.

[SOURCE: IEC 62031, 3.2, modified – The definition is reworded and notes to entry are

added.]
3.19.1
built-in LED module

LED module, generally designed to form a replaceable part to be built into a luminaire, a box,

an enclosure or the like and not intended to be mounted outside a luminaire,
...

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