IEC 63128:2019

Lighting control interface for dimming - Analogue voltage dimming interface for electronic current sourcing controlgear

IEC 63128:2019 specifies the analogue control interface of controlgear which has the function of controlling the output of the controlgear. The output of the controlgear is controlled between minimum/off and maximum values by the voltage control device sinking the controlgear current source.
This document does not specify safety requirements for the analogue interface of controlgear. Safety requirements are given in IEC 61347 (all parts).

Interface de commande d'éclairage pour variation d'intensité - Interface de variation de tension analogique pour appareillage d'alimentation électronique

L'IEC 63128:2019 spécifie l’interface de commande analogique de l’appareillage qui exerce la fonction de commande des valeurs de sortie de l’appareillage. Les valeurs de sortie de l’appareillage sont commandées entre la valeur minimale/d’arrêt et la valeur maximale par l’appareillage de commande de tension qui abaisse le niveau de sortie de l’appareillage d’alimentation.
Le présent document ne spécifie pas d'exigences de sécurité pour l'interface analogique des appareillages d’alimentation. Ces exigences de sécurité sont données dans l'IEC 61347 (toutes les parties).

General Information

• Status: Published
• Publication Date: 11-Jul-2024
• ICS: 29.140.99 - Other standards related to lamps
• Technical Committee: TC 34 - Lighting
• Drafting Committee: WG 11 - TC 34/WG 11
• Current Stage: PPUB - Publication issued
• Start Date: 20-May-2019
• Completion Date: 24-May-2019

Relations

• Amended By: IEC 63128:2019/AMD1:2024 - Amendment 1 - Lighting control interface for dimming - Analogue voltage dimming interface for electronic current sourcing controlgear
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 63128 ®
Edition 1.1 2024-07
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Lighting control interface for dimming – Analogue voltage dimming interface for
electronic current sourcing controlgear

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews, graphical symbols and the glossary.
committee, …). It also gives information on projects, replaced With a subscription you will always have access to up to date
and withdrawn publications. content tailored to your needs.

IEC Just Published - webstore.iec.ch/justpublished
Electropedia - www.electropedia.org
Stay up to date on all new IEC publications. Just Published
The world's leading online dictionary on electrotechnology,
details all new publications released. Available online and once
containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.

Also known as the International Electrotechnical Vocabulary
IEC Customer Service Centre - webstore.iec.ch/csc
(IEV) online.
If you wish to give us your feedback on this publication or need

further assistance, please contact the Customer Service
Centre: [e-mail].
IEC 63128 ®
Edition 1.1 2024-07
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Lighting control interface for dimming – Analogue voltage dimming interface for
electronic current sourcing controlgear
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.140.99 ISBN 978-2-8322-9412-3
REDLINE VERSION – 2 – IEC 63128:2019+AMD1:2024 CSV
© IEC 2024
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General remarks on tests . 7
4.1 Disconnected control signal . 7
4.2 Type test . 7
4.3 Test order and application of test . 7
5 Marking . 7
6 System description . 8
6.1 General . 8
6.2 Control signal voltage range and characteristics . 8
6.3 Dimming curve . 9
6.4 Control input current limits . 9
6.5 Switch-on . 9
7 Simulation of incandescent dimming (optional) . 10
7.1 General . 10
7.2 Response to light source dimming. 10
7.3 Dim-to-warm marking . 11
Annex A (informative) Warm dim control for analogue dimming having controlgear with
a linear output power to control voltage response . 12
A.1 General . 12
A.2 Correlation to 0 V to 10 V control . 12
Bibliography . 15

Figure 1 – Marking of controllable electronic light source controlgear . 7
Figure 2 – Functional specification for DC voltage control . 8
Figure 3 – Connection diagram for several controllable electronic lamp controlgear . 8
Figure 4 – Marking of dim-to-warm electronic light source controlgear . 11
Figure A.1 – Typical warm dimming LED system utilizing two LED sources . 12
Figure A.2 – Full power rated CCT: 2 700 K – Dimmed relative power minimum: 10 % . 13
Figure A.3 – Full power rated CCT: 3 000 K – Dimmed relative power minimum: 10 % . 14
Figure A.4 – Full power rated CCT: 3 000 K – Dimmed relative power minimum: 30 % . 14

Table 1 – Control signal related to the electronic light source controlgear output power
(light level of the dimming curve) . 9

© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIGHTING CONTROL INTERFACE FOR DIMMING –
ANALOGUE VOLTAGE DIMMING INTERFACE FOR
ELECTRONIC CURRENT SOURCING CONTROLGEAR

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
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.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 63128 edition 1.1 contains the first edition (2019-05) [documents 34/592/FDIS and
34/609/RVD] and its amendment 1 (2024-07) [documents 34/1053/CDV and
34/1137A/RVC].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
REDLINE VERSION – 4 – IEC 63128:2019+AMD1:2024 CSV
© IEC 2024
International Standard IEC 63128 has been prepared by IEC technical committee 34: Lamps
and related equipment.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document and its amendment 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 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.
© IEC 2024
LIGHTING CONTROL INTERFACE FOR DIMMING –
ANALOGUE VOLTAGE DIMMING INTERFACE FOR
ELECTRONIC CURRENT SOURCING CONTROLGEAR

1 Scope
This document specifies the analogue control interface of controlgear which has the function
of controlling the output of the controlgear. The output of the controlgear is controlled
between minimum/off and maximum values by the voltage control device sinking the
controlgear current source.
This document does not specify safety requirements for the analogue interface of controlgear.
Safety requirements are given in IEC 61347 (all parts).
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 terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
controlgear
unit inserted between the electrical supply and at least one light
source, which serves to supply the light source(s) with its (their) rated voltage or rated
current, and can consist of one or more separate components
Note 1 to entry: The controlgear may include means for igniting, dimming, correcting the power factor and
suppressing radio interference, and further control functions.
Note 2 to entry: The controlgear consists of a power supply and a control unit.
Note 3 to entry: The terms “control gear” and “controlgear” are interchangeable. In IEC standards, the term
“controlgear” is commonly used.
3.2
controllable lamp controlgear
electronic controlgear whose lamp operating characteristics can be changed by means of a
separate control input signal
[SOURCE: IEC 61347-1:2015, 3.2.3, modified – "ballast" has been replaced with "lamp
controlgear" and "a signal via mains or extra control input" has been replaced with "a separate
control input signal".]
REDLINE VERSION – 6 – IEC 63128:2019+AMD1:2024 CSV
© IEC 2024
3.3
control terminal
terminal intended to connect an item to a circuit or device capable of supplying or receiving
an electronic control signal to the item
Note 1 to entry: Control inputs for other control signals (for example IEC 62386 (all parts), IEC 62756-1) are
excluded.
[SOURCE: IEC 60050-845:—, 845-28-062, modified – The note has been added.]
3.4
control signal
DC voltage that is used to set the output power of the lamp controlgear
3.5
control unit of the controlgear
electronic device, being part of the controlgear, designed for
controlling the electric energy to the LED light source
Note 1 to entry: The purpose of controlling the electric energy can be colour mixing, responding to depreciating
luminous flux, and other features.
Note 2 to entry: In LEDsi modules, the control unit of the control gear is part of the LED module and separate
from the power supply of the control gear.
[SOURCE: IEC 60050-845:—, 845-28-057]
3.8
correlated colour temperature factor
CCTF
ratio of the dimmed CCT to the full power CCT
Note 1 to entry: This ratio is used in the calculation of warm dimming responses for applicable LED systems.
Note 2 to entry: CCT (correlated colour temperature) is defined in IEV 845-23-068.
3.6
electric light source
light source
primary light source with the means for connecting to the electric supply and usually designed
to be incorporated into a luminaire
Note 1 to entry: An electric light source can be a lamp, provided with a lamp cap, or LED module designed to be
connected by terminals, connectors or similar devices.
3.7
output power
electrical power supplied from the electronic lamp
controlgear at the output terminals of the electronic lamp controlgear
3.9
warm dimming
capability of controlgear to decrease the colour temperature of its LED light sources as the
power, and therefore the luminous flux output of the light sources is decreased

© IEC 2024
4 General remarks on tests
4.1 Disconnected control signal
If the control signal is not received, the lamp controlgear shall provide the rated power or
maximum of the rated power range or the system failure level, if applicable and described by
the manufacturer.
4.2 Type test
Tests according to this document are type tests.
The requirements and tolerances permitted by this document are based on the testing of a
type test sample submitted by the manufacturer for that purpose. In principle this type test
sample should consist of units having characteristics typical of the manufacturer’s production
and be as close to the production centre point values as possible. For guidance on sampling
plans and procedures for inspection by attributes, see ISO 2859-1.
4.3 Test order and application of test
The tests shall be carried out in the order of the clauses, unless otherwise specified.
One lamp controlgear shall be submitted to all tests, unless otherwise stated.
In general, all tests are made on each type of lamp controlgear or where a power range of
similar lamp controlgear is involved, for each rated power in the range or on a representative
selection from the range as given by the manufacturer.
5 Marking
Controllable electronic light source controlgear in accordance with this document shall be
clearly marked with the following marking (see Figure 1):

Figure 1 – Marking of controllable electronic light source controlgear
The preferred marking size should be 8 mm x 16 mm (H x L).
Markings should be readable with normal vision.

REDLINE VERSION – 8 – IEC 63128:2019+AMD1:2024 CSV
© IEC 2024
6 System description
6.1 General
The circuit diagram of the functional specification for DC voltage control is shown in Figure 2.

Figure 2 – Functional specification for DC voltage control
The output power of a controllable lamp controlgear is controlled by the control signal applied
to the control input of the controllable lamp controlgear.
Depending on the current sink capability of the control device, and the total maximum source
current for all controllable lamp controlgear, several controllable lamp controlgear can be
connected to one control device (see Figure 3).

Figure 3 – Connection diagram for several controllable electronic lamp controlgear
6.2 Control signal voltage range and characteristics
The control input voltage V shall be in the range of:
-20 V < V < +20 V.
In this range the controlgear shall not be damaged.
The control terminals shall be protected against the application of reversed polarity. In that
case, the electronic lamp controlgear shall operate with minimum output power or shall not
operate.
The control signal shall have the following characteristics:
Control signal range
V = between 0 V and 1 V: minimum value of output power (minimum light output).

© IEC 2024
V = between 1 V and 10 V: output power increasing from minimum to maximum value,
see 6.3.
V = between 10 V and 11 V: maximum value of output power (maximum light output)
V = between 0 V and 11 V: stable output power, where stable light output is expected.
If the control terminals of the controllable controlgear are not connected to a control device
(open circuit) the controlgear shall provide the maximum output power (the light output shall
be the maximum light output).
This shall be tested by measuring the output power.
6.3 Dimming curve
The dimming curve is defined using the values in Table 1.
Table 1 – Control signal related to the electronic light source controlgear
output power (light level of the dimming curve)
Control signal voltage VDC at the Minimum output power Maximum output power
electronic light source controlgear

control terminals
in V in % of the maximum level in % of the maximum level
≤ 1 min min +15
5 45 65
7 70 90
10 90 100
> 10 100 100
NOTE If the electronic lamp controlgear is designed as a power source based on a current source, then the
values given in the table are percentages of the rated current. If the electronic lamp controlgear is designed as a
power source based on a voltage source, then the values given in the table are the percentages of the rated
voltage.
In the case of electronic light source controlgear with a minimum physically possible value of
output power higher than a value in the table, the table shall be applied only above this lowest
possible value.
6.4 Control input current limits
Controlgear in relation to this document acts as a current source. Limits for the control input
current to be sourced by the controlgear are 100 µA minimum and 2 mA maximum, for the
input voltage range of 0 V to 11 V.
The nominal value of the control input current shall be declared in the manufacturer’s
literature or stated on the lamp controlgear.
6.5 Switch-on
The switch-on of the controlgear is permitted at any dimming position.
This shall be tested by visual inspection.

REDLINE VERSION – 10 – IEC 63128:2019+AMD1:2024 CSV
© IEC 2024
7 Simulation of incandescent dimming (optional)
7.1 General
Warm dimming is an optional feature implemented in some lighting controlgear to imitate the
behaviour of incandescent filament sources as the power supplied to them is decreased. If
warm dimming is implemented, 7.2 shall apply.
For lighting systems that implement warm dimming and can utilize a variety of luminaires or
light sources, uniform warm dimming response can be important for colour consistency
throughout the lighting system.
7.2 Response to light source dimming
For an LED dim-to-warm system, the resultant output CCT for a given output power P, is
determined as follows:
P = P/P
r max
0,37
CCTF = P
r
CCT = CCTF × CCT
max
where
P is the power delivered to the LEDs;
P is the maximum undimmed power delivered to the LEDs;
max
P is the relative power;
r
CCTF is the CCT factor;
CCT is the maximum CCT;
max
CCT is the resultant output CCT at the given output power P.
Annex A provides examples of a relationship between the CCTF and an analogue 0 V to 10 V
control voltage.
When implementing warm dimming, it is recommended that the minimum CCT is no less than
1 800 K.
© IEC 2024
7.3 Dim-to-warm marking
Electronic light source controlgear utilizing the dim-to-warm functionality in accordance with
this document shall be clearly marked with the following marking (see Figure 4):

Figure 4 – Marking of dim-to-warm electronic light source controlgear
Markings should be readable with normal vision.

REDLINE VERSION – 12 – IEC 63128:2019+AMD1:2024 CSV
© IEC 2024
Annex A
(informative)
Warm dim control for analogue dimming having controlgear
with a linear output power to control voltage response
A.1 General
Typically, dimming an LED simply lowers its luminous flux output while maintaining its rated
colour temperature. Legacy heated filament lamps (incandescent) respond to dimming by a
significant shift to warmer colour temperatures at lower power. This dim-to-warm
characteristic is often a desirable response. Implementation of a dim-to-warm feature in an
LED luminaire allows this response to be available along with the other positive features of
LED equipment.
Typical warm dim systems utilize a dimmable LED driver with at least two output channels.
Each channel controls an LED of a different colour temperature (CCT). The overall CCT of the
system is controlled by independently varying the power delivered to each of the LEDs and
mixing the output of all the LED sources to achieve a composite, uniform CCT. As an
example, a basic block diagram of a two-channel system is shown in Figure A.1.

Figure A.1 – Typical warm dimming LED system utilizing two LED sources
A.2 Correlation to 0 V to 10 V control
In the warm dim control standard as described in Clause 7, the CCT during dimming is based
on the relative power supplied to the LED source. Determining the CCT factor as a function of
the 0 V to 10 V control voltage, V , of an analogue dimmer is more complex since the control
c
voltage to power function is not completely defined for the controlgear. The minimum dimmed
power depends on the design of the controlgear and should be taken into account in the
calculation of the CCTF.
For controlgear that meets the following criteria, the CCTF for a given control voltage V can
c
be calculated using Formula (A.1) where:
• the total LED power, P, is the sum of all power delivered to the LEDs involved in the dim-
to-warm function;
• the minimum total LED power, P , occurs when V = V ;
min c min
© IEC 2024
• the maximum total LED power, P , occurs when V = V ;
max c max
• the minimum relative power, P = P / P ;
r(min), min max
• the controlgear output increases linearly between minimum and maximum power.
0,37
 

VV-
c min
CCTF V ×1- P+ P (A.1)
( )  
 ( )
c r(min) r(min)
 
VV-
max min
 
A graphical representation of the relationship between CCTF, relative LED power and a 0 V to
10 V control signal for a warm dim system is shown in Figure A.2, Figure A.3 and Figure A.4
for three different configurations. The required CCT and the 0 V to 10 V control are shown on
the two vertical axes as a function of relative power. To find a CCT for a desired control
voltage, the voltage is located on the right vertical axis, projected across to the dashed plot
then projected vertically to the CCT curve where the required CCT is found on the left vertical
axis. The process is shown with dotted lines in Figure A.2 for a 5 V control voltage resulting in
an approximate CCT of 2 100 K (actually 2 089 K). All examples assume the CCT will not
drop below 1 800 K.
NOTE The CCT flattens out at the minimum of 1 800 K at approximately 35 % of full power.
Figure A.2 – Full power rated CCT: 2 700 K –
Dimmed relative power minimum: 10 %
=
REDLINE VERSION – 14 – IEC 63128:2019+AMD1:2024 CSV
© IEC 2024
NOTE The CCT flattens out at the minimum of 1 800 K at approximately 25 % of full power. The minimum is
reached later in the dim curve than for that shown in Figure A.2 because the CCT at full power is higher.
Figure A.3 – Full power rated CCT: 3 000 K –
Dimmed relative power minimum: 10 %

NOTE The CCT does not flatten out as shown in Figure A.2 and Figure A.3 because the minimum relative power
is higher, so the 1 800 K limit is not reached.
Figure A.4 – Full power rated CCT: 3 000 K –
Dimmed relative power minimum: 30 %

© IEC 2024
Bibliography
[1] IEC 60050-845:— , International Electrotechnical Vocabulary – Part 845: Lighting
[2] IEC 61347 (all parts), Lamp controlgear
[3] IEC 61347-1, Lamp controlgear – Part 1: General and safety requirements
[4] IEC 61347-2-2, Lamp controlgear – Part 2-2: Particular requirements for d.c. or a.c.
supplied electronic step-down convertors for filament lamps
[5] IEC 61347-2-3, Lamp controlgear – Part 2-3: Particular requiremen
...

IEC 63128 ®
Edition 1.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Lighting control interface for dimming – Analogue voltage dimming interface for
electronic current sourcing controlgear

Interface de commande d'éclairage pour variation d’intensité – Interface de
variation de tension analogique pour appareillage d’alimentation électronique

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.

IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées
antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC 63128 ®
Edition 1.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Lighting control interface for dimming – Analogue voltage dimming interface for

electronic current sourcing controlgear

Interface de commande d'éclairage pour variation d’intensité – Interface de

variation de tension analogique pour appareillage d’alimentation électronique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.99 ISBN 978-2-8322-6872-8

– 2 – IEC 63128:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General remarks on tests . 6
4.1 Disconnected control signal . 6
4.2 Type test . 6
4.3 Test order and application of test . 7
5 Marking . 7
6 System description . 7
6.1 General . 7
6.2 Control signal voltage range and characteristics . 8
6.3 Dimming curve . 8
6.4 Control input current limits . 9
6.5 Switch-on . 9
Bibliography . 10

Figure 1 – Marking of controllable electronic light source controlgear . 7
Figure 2 – Functional specification for DC voltage control . 7
Figure 3 – Connection diagram for several controllable electronic lamp controlgear . 8

Table 1 – Control signal related to the electronic light source controlgear output power
(light level of the dimming curve) . 9

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIGHTING CONTROL INTERFACE FOR DIMMING –
ANALOGUE VOLTAGE DIMMING INTERFACE FOR
ELECTRONIC CURRENT SOURCING CONTROLGEAR

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
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) 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 63128 has been prepared by IEC technical committee 34: Lamps
and related equipment.
The text of this International Standard is based on the following documents:
FDIS Report on voting
34/592/FDIS 34/609/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – IEC 63128:2019 © IEC 2019
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document 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.
LIGHTING CONTROL INTERFACE FOR DIMMING –
ANALOGUE VOLTAGE DIMMING INTERFACE FOR
ELECTRONIC CURRENT SOURCING CONTROLGEAR

1 Scope
This document specifies the analogue control interface of controlgear which has the function
of controlling the output of the controlgear. The output of the controlgear is controlled
between minimum/off and maximum values by the voltage control device sinking the
controlgear current source.
This document does not specify safety requirements for the analogue interface of controlgear.
Safety requirements are given in IEC 61347 (all parts).
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 terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
controlgear
unit inserted between the electrical supply and at least one light
source, which serves to supply the light source(s) with its (their) rated voltage or rated
current, and can consist of one or more separate components
Note 1 to entry: The controlgear may include means for igniting, dimming, correcting the power factor and
suppressing radio interference, and further control functions.
Note 2 to entry: The controlgear consists of a power supply and a control unit.
Note 3 to entry: The terms “control gear” and “controlgear” are interchangeable. In IEC standards, the term
“controlgear” is commonly used.
3.2
controllable lamp controlgear
electronic controlgear whose lamp operating characteristics can be changed by means of a
separate control input signal
[SOURCE: IEC 61347-1:2015, 3.2.3, modified – "ballast" has been replaced with "lamp
controlgear" and "a signal via mains or extra control input" has been replaced with "a separate
control input signal".]
– 6 – IEC 63128:2019 © IEC 2019
3.3
control terminal
terminal intended to connect an item to a circuit or device capable of supplying or receiving
an electronic control signal to the item
Note 1 to entry: Control inputs for other control signals (for example IEC 62386 (all parts), IEC 62756-1) are
excluded.
[SOURCE: IEC 60050-845:—, 845-28-062, modified – The note has been added.]
3.4
control signal
DC voltage that is used to set the output power of the lamp controlgear
3.5
control unit of the controlgear
electronic device, being part of the controlgear, designed for
controlling the electric energy to the LED light source
Note 1 to entry: The purpose of controlling the electric energy can be colour mixing, responding to depreciating
luminous flux, and other features.
Note 2 to entry: In LEDsi modules, the control unit of the control gear is part of the LED module and separate
from the power supply of the control gear.
[SOURCE: IEC 60050-845:—, 845-28-057]
3.6
electric light source
light source
primary light source with the means for connecting to the electric supply and usually designed
to be incorporated into a luminaire
Note 1 to entry: An electric light source can be a lamp, provided with a lamp cap, or LED module designed to be
connected by terminals, connectors or similar devices.
3.7
output power
electrical power supplied from the electronic lamp
controlgear at the output terminals of the electronic lamp controlgear
4 General remarks on tests
4.1 Disconnected control signal
If the control signal is not received, the lamp controlgear shall provide the rated power or
maximum of the rated power range or the system failure level, if applicable and described by
the manufacturer.
4.2 Type test
Tests according to this document are type tests.
The requirements and tolerances permitted by this document are based on the testing of a
type test sample submitted by the manufacturer for that purpose. In principle this type test
sample should consist of units having characteristics typical of the manufacturer’s production
and be as close to the production centre point values as possible. For guidance on sampling
plans and procedures for inspection by attributes, see ISO 2859-1.

4.3 Test order and application of test
The tests shall be carried out in the order of the clauses, unless otherwise specified.
One lamp controlgear shall be submitted to all tests, unless otherwise stated.
In general, all tests are made on each type of lamp controlgear or where a power range of
similar lamp controlgear is involved, for each rated power in the range or on a representative
selection from the range as given by the manufacturer.
5 Marking
Controllable electronic light source controlgear in accordance with this document shall be
clearly marked with the following marking (see Figure 1):

Figure 1 – Marking of controllable electronic light source controlgear
The preferred marking size should be 8 mm x 16 mm (H x L).
6 System description
6.1 General
The circuit diagram of the functional specification for DC voltage control is shown in Figure 2.

Figure 2 – Functional specification for DC voltage control
The output power of a controllable lamp controlgear is controlled by the control signal applied
to the control input of the controllable lamp controlgear.
Depending on the current sink capability of the control device, and the total maximum source
current for all controllable lamp controlgear, several controllable lamp controlgear can be
connected to one control device (see Figure 3).

– 8 – IEC 63128:2019 © IEC 2019

Figure 3 – Connection diagram for several controllable electronic lamp controlgear
6.2 Control signal voltage range and characteristics
The control input voltage V shall be in the range of:
-20 V < V < +20 V.
In this range the controlgear shall not be damaged.
The control terminals shall be protected against the application of reversed polarity. In that
case, the electronic lamp controlgear shall operate with minimum output power or shall not
operate.
The control signal shall have the following characteristics:
Control signal range
V = between 0 V and 1 V: minimum value of output power (minimum light output).
V = between 1 V and 10 V: output power increasing from minimum to maximum value,
see 6.3.
V = between 10 V and 11 V: maximum value of output power (maximum light output)
V = between 0 V and 11 V: stable output power, where stable light output is expected.
If the control terminals of the controllable controlgear are not connected to a control device
(open circuit) the controlgear shall provide the maximum output power (the light output shall
be the maximum light output).
This shall be tested by measuring the output power.
6.3 Dimming curve
The dimming curve is defined using the values in Table 1.

Table 1 – Control signal related to the electronic light source controlgear
output power (light level of the dimming curve)
Control signal voltage VDC at the Minimum output power Maximum output power
electronic light source controlgear

control terminals
in V in % of the maximum level in % of the maximum level
≤ 1 min min +15
5 45 65
7 70 90
10 90 100
> 10 100 100
NOTE If the electronic lamp controlgear is designed as a power source based on a current source, then the
values given in the table are percentages of the rated current. If the electronic lamp controlgear is designed as a
power source based on a voltage source, then the values given in the table are the percentages of the rated
voltage.
In the case of electronic light source controlgear with a minimum physically possible value of
output power higher than a value in the table, the table shall be applied only above this lowest
possible value.
6.4 Control input current limits
Controlgear in relation to this document acts as a current source. Limits for the control input
current to be sourced by the controlgear are 100 µA minimum and 2 mA maximum, for the
input voltage range of 0 V to 11 V.
The nominal value of the control input current shall be declared in the manufacturer’s
literature or stated on the lamp controlgear.
6.5 Switch-on
The switch-on of the controlgear is permitted at any dimming position.
This shall be tested by visual inspection.

– 10 – IEC 63128:2019 © IEC 2019
Bibliography
[1] IEC 60050-845:— , International Electrotechnical Vocabulary – Part 845: Lighting
[2] IEC 61347 (all parts), Lamp controlgear
[3] IEC 61347-1, Lamp controlgear – Part 1: General and safety requirements
[4] IEC 61347-2-2, Lamp controlgear – Part 2-2: Particular requirements for d.c. or a.c.
supplied electronic step-down convertors for filament lamps
[5] IEC 61347-2-3, Lamp controlgear – Part 2-3: Particular requirements for a.c. and/or
d.c. supplied electronic controlgear for fluorescent lamps
[6] IEC 61347-2-12, Lamp controlgear – Part 2-12: Particular requirements for d.c. or a.c.
supplied electronic ballasts for discharge lamps (excluding fluorescent lamps)
[7] IEC 61347-2-13, Lamp controlgear – Part 2-13: Particular requirements for d.c. or a.c.
supplied electronic controlgear for LED mod
...