International lamp coding system (ILCOS)

IEC 61231:2010 gives the rules for the international lamp coding system and covers all lamp categories, excluding vehicle lamps. Coding for the main lamp types is specified and, for the others, will follow by amendments to this standard as appropriate. This first edition cancels and replaces the second edition of IEC 61231, published as a technical specification. It constitutes a technical revision, of which the main changes are indicated below: - introduction of LED modules (Subclause 5.8).

Système international de codification des lampes (ILCOS)

La CEI 61231:2010 détaille les règles du système international de codification des lampes et couvre toutes les catégories de lampes, à l'exception des lampes pour véhicules. La codification des principaux types de lampes y est spécifiée; celle des autres types suivra, sous la forme d'amendements à cette norme. Cette première édition annule et remplace la deuxième édition de la CEI 61231, publiée comme spécification technique. Elle constitue une révision technique, dont les principales modifications sont indiquées ci-dessous: - introduction des DEL (Paragraphe 5.8).

General Information

Status
Published
Publication Date
13-Jan-2010
Current Stage
PPUB - Publication issued
Start Date
14-Jan-2010
Completion Date
14-Jan-2010
Ref Project

Buy Standard

Standard
IEC 61231:2010 - International lamp coding system (ILCOS)
English and French language
48 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 61231
Edition 1.0 2010-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
International lamp coding system (ILCOS)
Système international de codification des lampes (ILCOS)
IEC 61231:2010
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2010 IEC, Geneva, Switzerland

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 la CEI ou du Comité national de la CEI du pays du demandeur.

Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette

publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: www.iec.ch
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 corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub

The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).

It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub

Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available

on-line and also by email.
ƒ Electropedia: www.electropedia.org

The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions

in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical

Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv

If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service

Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
A propos de la CEI

La Commission Electrotechnique Internationale (CEI) 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 CEI

Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez

l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
ƒ Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm

Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,

texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.

ƒ Just Published CEI: www.iec.ch/online_news/justpub

Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles

publications parues. Disponible en-ligne et aussi par email.
ƒ Electropedia: www.electropedia.org

Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et

définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé

Vocabulaire Electrotechnique International en ligne.
ƒ Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm

Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du

Service clients ou contactez-nous:
Email: csc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
---------------------- Page: 2 ----------------------
IEC 61231
Edition 1.0 2010-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
International lamp coding system (ILCOS)
Système international de codification des lampes (ILCOS)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.140 ISBN 978-2-88910-449-9
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61231 © IEC:2010
CONTENTS

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

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

1 Scope and object ..............................................................................................................6

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

3 Principles .........................................................................................................................6

4 Basic structure..................................................................................................................7

4.1 Letter section...........................................................................................................7

4.2 Figure section..........................................................................................................7

4.3 Length of the code...................................................................................................8

5 Lamp categories ...............................................................................................................9

5.1 Tungsten filament lamps..........................................................................................9

5.2 Tungsten halogen lamps (non-vehicle)...................................................................12

5.3 Fluorescent lamps .................................................................................................13

5.4 High-pressure sodium vapour lamps ......................................................................17

5.5 Low-pressure sodium vapour lamps .......................................................................18

5.6 High-pressure mercury vapour lamps.....................................................................19

5.7 Metal halide lamps.................................................................................................19

5.8 LED modules.........................................................................................................21

5.9 Special lamps ........................................................................................................22

Annex A (informative) Survey ILCOS L – short version, letter section...................................23

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

Table 1 – Dimensions............................................................................................................15

---------------------- Page: 4 ----------------------
61231 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INTERNATIONAL LAMP CODING SYSTEM (ILCOS)
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 61231 has been prepared by subcommittee 34A: Lamps, of IEC

technical committee 34: Lamps and related equipment.

This first edition cancels and replaces the second edition of IEC 61231, published as a

technical specification. It constitutes a technical revision, of which the main changes are

indicated below:
– introduction of LED modules (Subclause 5.8).
The text of this standard is based on the following documents:
CDV Report on voting
34A/1345/CDV 34A/1374/RVC

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.

---------------------- Page: 5 ----------------------
– 4 – 61231 © IEC:2010

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

maintenance result 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.
---------------------- Page: 6 ----------------------
61231 © IEC:2010 – 5 –
INTRODUCTION

The lamp industry strives continuously to meet customers' needs. Its innovative power has led

to a tremendous variety of different light sources. To enable customers and experts to find their

way within the diversity of products, a general system for the coding of lamps has been

developed.

The code does not replace specific markings used by individual manufacturers on their lamps

or in their catalogues, but it is promoted for cross-referencing purposes and, in due course, to

replace national and regional lamp coding systems which already exist.

NOTE The code does not give all the technical characteristics necessary to specify a lamp fully. For this the

relevant lamp standard and/or the manufacturer’s literature have to be consulted.

---------------------- Page: 7 ----------------------
– 6 – 61231 © IEC:2010
INTERNATIONAL LAMP CODING SYSTEM (ILCOS)
1 Scope and object

This International Standard gives the rules for the international lamp coding system and covers

all lamp categories, excluding vehicle lamps. Coding for the main lamp types is specified and,

for the others, will follow by amendments to this standard as appropriate.
The object of the international lamp coding system is
– to improve communication about the different types of lamps;

– to help in discussions concerning interchangeability and compatibility of products;

– to create a closer relationship between international standards and manufacturers’ literature

(for example the code could be given in future in the relevant parts of a standard);

– to enable correct replacements of lamps;
– to be used as a complementary marking on the luminaire;
– to replace national and regional coding systems.
2 Normative references

The following referenced documents are indispensable for the application of this document. For

dated references, only the edition cited applies. For undated references, the latest edition of

the referenced document (including any amendments) applies.
IEC 60357, Tungsten halogen lamps (non-vehicle) – Performance specifications

IEC 60432-1, Incandescent lamps – Safety specifications – Part 1: Tungsten filament lamps for

domestic and similar general lighting purposes

IEC 60432-2, Incandescent lamps – Safety specifications – Part 2: Tungsten halogen lamps for

domestic and similar general lighting purposes

IEC 60838-2-2, Miscellaneous lampholders – Part 2-2: Particular requirements – Connectors

for LED-modules
IEC/TR 60887, Glass bulb designation system for lamps
IEC 61167, Metal halide lamps
CIE publication 29.2, Guide on interior lighting
3 Principles

The international lamp coding system has been developed on the basis of the following

principles.
– It should be manufacturer-independent concerning its content and its wording.
– A relationship between the coding system and international standards should be
established.
---------------------- Page: 8 ----------------------
61231 © IEC:2010 – 7 –

– It should be internationally acceptable. It is recognized that other systems with national and

regional importance exist and that the change to an international code should be seen as a

long-term process.

– The length of the code should be as short as possible and as long as necessary. Therefore,

it should be possible to use the code in different lengths depending on the different

purposes.

– In view of the technical diversity of the different lamp categories, it would not be practical to

define the code for all types in the same way; the code depends therefore in its composition

on the technical needs of the different lamp categories.

– The code should not replace manufacturer-specific marking on the lamp or in the

catalogues, but should be used for cross-references in lamp and luminaire literature.

– The allocation of codes is based on interchangeability and compatibility.

An additional usage of the code on the lamp package should be envisaged for the future.

4 Basic structure
The complete lamp code ILCOS consists of a letter section and a figure section.
4.1 Letter section
The first letter of the letter section designates the lamp category as follows:
I Tungsten filament lamps
H Tungsten halogen lamps (non-vehicle)
F Fluorescent lamps
S High-pressure sodium lamps
L Low-pressure sodium lamps
Q High-pressure mercury lamps
M Metal halide lamps
D LED modules
X Special lamps

NOTE Vehicle lamps, including their coding, are covered by national and/or regional legislation.

The next letters within the letter section give further details as outlined in the description of the

different lamp categories. The letter section is separated from the rest by a hyphen.

4.2 Figure section

The figure section consists of several blocks mainly containing figures. Each block, separated

by hyphens, contains characteristic values of lamps such as
– wattage;
– voltage;
– lamp cap;
– dimensional values.

As a hyphen is used to separate the blocks, it cannot be applied within a block. As a

consequence, the sign of equality = is used instead of the hyphen, for example within the cap

designation.

The sequence and the specific content of the blocks is determined for each lamp category and

described in 5.1 to 5.8.
---------------------- Page: 9 ----------------------
– 8 – 61231 © IEC:2010
4.3 Length of the code
4.3.1 General

The code can be used in different lengths depending on the purpose. In catalogues and

leaflets, specialities, for example special applications, can be indicated with an asterisk (*) in

the place where the difference occurs or at the end of the code and explained in a separate

remark, also indicated with an asterisk (*).

The code can be shortened by deleting parts from the end, not by deleting intermediate parts.

In general, if ‘standard’ types are concerned, the dimension block can be omitted. Intermediate

parts may be omitted, providing the separating signs such as hyphens (–) and slashes (/) are

given.
NOTE These shortening rules do not apply to the extended short version ILCOS LE.
4.3.2 Short version: ILCOS L

The short version consists of the letter section or a part of it and is called ILCOS L. It can be

used for the general classification of lamps. A survey of ILCOS L is given in Annex A.

4.3.3 Extended short version: ILCOS LE

The extended short version, where applicable, consists of the first part of the letter section

(ILCOS L) immediately followed (without spaces) by the relevant dimensions.
4.3.4 Standard version: ILCOS D

The standard version gives the complete designation and consists of the letter section and (a

part of) the figure section. The use of ILCOS D should enable the customer to find the correct

lamp type, for example in the case of lamp replacement from a different manufacturer. It can

be used for the purpose of marking luminaires, when suitable also in an abbreviated form.

---------------------- Page: 10 ----------------------
61231 © IEC:2010 – 9 –
5 Lamp categories

For information about relevant lamp standards and lamp-related standards, see the IEC

publications prepared by IEC technical committee 34.
5.1 Tungsten filament lamps
5.1.1 ILCOS L for tungsten filament lamps
The ILCOS L code is built up as follows:
Tungsten filament lamps
Non-reflector lamps Reflector lamps
IA IB IN
Large lamps Compact bulb lamps Other non-reflector lamps
(bulb diameter usually (bulb diameter usually (lamps outside the scope
of IEC 60432-1)
> 45 mm) ≤ 45 mm)
Pear-shaped, mushroom or Candle, round bulb or lamps
lamps with other shapes with other shapes intended
intended for use in the same for use in the same luminaire
luminaire

After the first two letters IA, IB and IN the shape of the bulb follows, indicated as specified in

IEC 60887.
The main bulb shape types are
A pear-shaped
B candle (bulged)
C conical
G globular
M mushroom
P round bulb
S pigmy (straight-sided)
T tubular
An example with a modifier is
BA candle with angular tip
---------------------- Page: 11 ----------------------
– 10 – 61231 © IEC:2010
For reflector lamps:
Reflector lamps
IRR IRA IRP IPAR IPARD
R bulb reflector Pear-shaped Round bulb bowl Normal PAR Dichroic PAR
lamps bowl mirror mirror lamps bulb reflector bulb reflector
lamps lamps lamps

If it is necessary to indicate the finish or the colour of a lamp, or the specific kind of reflector or

other technical details, this can be done after a slash as follows:
/C clear
/F frosted, frosted equivalently coated
/W white
/R red
/B blue
/G green
/Y yellow
/V violet
/P pink
/A amber
/O orange
/S silver
/X gold
/N neodymium
/D decorative filament design
A second letter may be added for the following purposes:
/ P to indicate pastel shades
/ F to indicate a window
T to indicate transparent colours
Further technical details can be given after a second slash:
//AX axial filament
//TR transversal filament
//RS rough service lamps
//LT limited surface temperature
//RT rough service with limited surface temperature
---------------------- Page: 12 ----------------------
61231 © IEC:2010 – 11 –
Examples
IAA/F Frosted pear-shaped lamps
IAM Mushroom lamps
IAT/W White-coated tubular lamps intended for use in the same luminaire
as pear-shaped lamps
IBBA/C Clear candle lamps with angular tip
IBP/R Red round bulb lamps
IAG Globular lamps, intended for use in the same luminaire as pear-shaped lamps
IBT/W White-coated tubular lamps, intended for use in the same luminaire
as round bulb lamps IBP

IBC Conical lamps, intended for use in the same luminaire as round bulb lamps IBP

IRA/S Pear-shaped bowl mirror lamp with silver reflector
5.1.2 ILCOS LE for tungsten filament lamps

ILCOS LE consists of the first part of ILCOS L up to and including the shape indication followed

by the number giving the nominal diameter of the lamp.
Examples
IAA60 Pear-shaped lamp with 60 mm nominal bulb diameter
IBP45 Round bulb lamp with 45 mm nominal bulb diameter
IAG80 Globular lamp with 80 mm nominal bulb diameter
5.1.3 ILCOS D for tungsten filament lamps
ILCOS D consists of the following blocks:
ILCOS L-wattage-rated voltage-lamp cap-dimensions

– Wattage: For miniature and/or glow lamps, the lamp current can be indicated in place of

the wattage. In that case, the lamp current value shall be immediately followed by a capital

– Rated voltage: In case of a voltage range, two numbers are given separated by a slash.

– For airfield lamps the lamp voltage may be replaced by the lamp current value immediately

followed by a capital A.

– Dimensions: This block consists normally only of the number giving the nominal diameter.

For tubular lamps the maximum overall length can be added after a slash. For reflector

lamps, the beam angle can be added after a slash. In case of a non-symmetrical beam, two

numbers separated by a slash may be given, the first describing the horizontal and the

second the vertical beam angle.
Examples

IAA/C-40-220/230-E27-60 Clear pear-shaped lamp, 40 W, 220-230 V, cap E27, nominal

diameter 60 mm
IBB/W-40---35 White candle lamp, 40 W, nominal diameter 35 mm, rest not
specified
IRR-60-240-B22d-125/30 R bulb reflector lamp, 60 W, 240 V, cap B22d, type R125,
beam angle 30°
---------------------- Page: 13 ----------------------
– 12 – 61231 © IEC:2010
5.2 Tungsten halogen lamps (non-vehicle)
5.2.1 ILCOS L for tungsten halogen lamps
The first two letters will be
HS Single-ended halogen lamps
HD Double-ended halogen lamps
HR Dichroic reflector halogen lamps
HM Metal reflector halogen lamps
HA Halogen lamps with aluminized glass reflector
HP Single-ended halogen lamps with proximity reflector
Third letter to indicate the field of application of the lamp:
P Projection including overhead projection and micro-film/-fiche lamps
S Photo/Studio/Theatre/Video
A Airfield
T Traffic signal
G General purpose (floodlight lamps are considered as general purpose)

A fourth letter can be used to indicate self-shielded lamps. Self-shielded lamps are lamps

designed to be suitable for use in open luminaires. Examples of self-shielded lamps are ELV

lamps with integral outer envelope, low-pressure tungsten halogen lamps and mains voltage

lamps which conform to IEC 60432-2 (for further information, see IEC 60357).
S Self-shielded halogen lamp
---

The bulb shape can be indicated after the third or fourth letter as described for tungsten

filament lamps.

If it is necessary to indicate the bulb finish, special colours or other technical details, this can

be done after one or two slashes as described for tungsten filament lamps (see 5.1.1).

Further technical details can be given after a second slash:
//UB UV reduction
//IB IR utilization
//S Short neck
Examples
HSGST Single-ended general purpose halogen lamps, self-shielded, tubular shaped
HDG Double-ended floodlight halogen lamps
HRG Dichroic reflector general purpose halogen lamps
HMGS Metal reflector general purpose halogen lamps, self-shielded
5.2.2 ILCOS LE for tungsten halogen lamps

ILCOS LE consists of ILCOS L up to the first slash immediately followed by the dimension

block as described in 5.2.3.
Examples
HRGS51 General purpose dichroic reflector lamp, self-shielded,
with a reflector diameter of 51 mm
---------------------- Page: 14 ----------------------
61231 © IEC:2010 – 13 –
HMGS37 General purpose metal reflector lamp, self-shielded,
with a reflector diameter of 37 mm
5.2.3 ILCOS D for tungsten halogen lamps
ILCOS D consists of the following blocks:
ILCOS L-wattage-rated voltage-lamp cap-dimensions

– Wattage: In the case of a two-filament lamp, the wattage of each filament is given

combined by a (+) sign.

Where needed for further distinction, this block can be extended by a slash to give

information concerning the colour temperature in the following way. The colour temperature

of the lamp is divided by 100 and the number obtained is rounded to an integer.

– Rated voltage: In case of a voltage range, two numbers are given separated by a slash.

For airfield lamps, the lamp voltage may be replaced by the lamp current value immediately

followed by a capital A.

– Dimensions: The content of this block depends on the specific characteristics of the

different halogen lamp types. Nominal values are given, except for the bulb diameter of

single-ended lamps. It can contain one value and, if needed for further discrimination,

a second one after a slash as follows:
ILCOS L Dimensions (nominal)
HS – Bulb diameter (max.)/light centre length
HD – Contact to contact length Z
nom
HR – Diameter of reflector/beam angle
HM – Diameter of reflector/beam angle
HA – Diameter of reflector/beam angle
HP – Light centre length
Examples
HSG-20-12-G4-22 Single-ended general purpose halogen lamp, 20 W, 12 V, G4
base, light centre length 22 mm

HDS-800-220/230-R7s-74,9 Double-ended photo/studio halogen lamp, 800 W, 220-230 V,

R7s cap, contact-to-contact length 74,9 mm
HRGS-50-12-GX5.3-51/30 Dichroic reflector general purpose halogen lamp, self-
shielded, 50 W, 12 V, base GX5.3, diameter 51 mm, beam
angle 30°
5.3 Fluorescent lamps
5.3.1 ILCOS L for fluorescent lamps
The first two letters will be
FD Double-capped lamps
FS Single-capped lamps
FB Self-ballasted lamps
Additional information can be indicated by a third letter as follows:
FDR Double-capped lamps with internal reflector
FDU Double-capped lamps, U-shaped
---------------------- Page: 15 ----------------------
– 14 – 61231 © IEC:2010
FSD Single-capped lamps, dual shaped
FSQ Single-capped lamps, quad shaped
FSS Single-capped lamps, square shaped
FSM Single-capped lamps, multi-limbed
FSC Single-capped lamps, circular shaped
FSG Single-capped lamps, globular
For FD and FS lamps a last letter can be added to indicate:
H For high frequency ballasts only
I Induction type lamp

For FB lamps the shape can be indicated as described for tungsten filament lamps (see 5.1.1).

A last letter can be added to indicate:
H Integral HF type ballast
---
I Integral induction type ballast
---

Colours or other bulb finishes can be indicated after a slash, as described for tungsten filament

lamps (see 5.1.1).
Further technical details can be given after a second slash as follows:
//L For use in low ambient temperatures
//H For use in high ambient temperatures
//P Photocell integrated
//PL Photocell integrated and for use in low ambient temperatures
//PH Photocell integrated and for use in high ambient temperatures
5.3.2 ILCOS LE for fluorescent lamps

ILCOS LE consists of ILCOS L (up to the first slash) immediately followed by the relevant

dimensions.
Examples
FD26 Double-capped lamp with nominal tube diameter 26 mm
FD38/1200 Double-capped lamp with nominal tube diameter 38 mm and nominal tube
length 1 200 mm (hence 40 W).
FD/1200 Double-capped lamp with nominal tube length 1 200 mm (36 W or 40 W)
5.3.3 ILCOS D for fluorescent lamps
ILCOS D consists of the following blocks:
ILCOS L-wattage-starting details (note)-lamp cap-dimensions
NOTE
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.