Double-capped LED lamps for general lighting services - Safety specifications

This International Standard specifies the safety and interchangeability requirements, and the
exchange operation together with the test methods and conditions required to show
compliance of double-capped LED lamps with G5 and G13 caps, intended for replacing
fluorescent lamps with the same caps, having:
– a rated power up to 125 W;
– a rated voltage of up to 250 V.
Such LED lamps are designed for replacement without requiring any internal modification of
the luminaire.
The existing luminaires, into which the double-capped LED lamps are fitted, can be operated
with electromagnetic or electronic controlgear.
The requirements of this standard relate only to type testing.
Recommendations for whole product testing or batch testing are given in Annex A.
NOTE 1 Where in this standard the term “lamp(s)” is used, it is understood to stand for “double-capped retrofit
LED lamp(s)”, except where it is obviously assigned to other types of lamps.
This standard does not cover double-capped conversion LED lamps where modification in the
luminaire is required. The requirements in this standard are given for general lighting service
(excluding for example explosive atmospheres). For lamps for other applications additional
requirements may apply.
NOTE 2 This standard includes photobiological safety.

Zweiseitig gesockelte LED-Lampen als Ersatz (Retrofit) für zweiseitig gesockelte Leuchtstofflampen - Sicherheitsanforderungen

Lampes à LED à deux culots conçues pour remplacer des lampes à fluorescence linéaires - Spécifications de sécurité

L'IEC 62776:2014 spécifie les exigences de sécurité et d'interchangeabilité, ainsi que l'opération de remplacement avec les méthodes d'essai et les conditions exigées pour assurer la conformité des lampes à LED à deux culots avec les culots G5 et G13, destinées à remplacer des lampes à fluorescence avec les mêmes culots, ayant: - une puissance assignée allant jusqu'à 125 W; - une tension assignée allant jusqu'à 250 V.

LED-sijalke z dvema vznožkoma za splošno razsvetljavo - Varnostne specifikacije (IEC 62776:2014)

General Information

Status
Published
Publication Date
17-May-2015
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
08-Apr-2015
Due Date
13-Jun-2015
Completion Date
18-May-2015

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SLOVENSKI STANDARD
SIST EN 62776:2015
01-junij-2015
LED-sijalke z dvema vznožkoma za splošno razsvetljavo - Varnostne specifikacije
(IEC 62776:2014)
Double-capped LED lamps for general lighting services - Safety specifications
Ta slovenski standard je istoveten z: EN 62776:2015
ICS:
29.140.01 Žarnice na splošno Lamps in general
SIST EN 62776:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 62776:2015
---------------------- Page: 2 ----------------------
SIST EN 62776:2015
EUROPEAN STANDARD EN 62776
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2015
ICS 29.140.99
English Version
Double-capped LED lamps designed to retrofit linear fluorescent
lamps - Safety specifications
(IEC 62776:2014 + COR1:2015)

Lampes à LED à deux culots conçues pour remplacer des Zweiseitig gesockelte LED-Lampen als Ersatz (Retrofit) für

lampes à fluorescence linéaires - Spécifications de sécurité zweiseitig gesockelte Leuchtstofflampen -

(IEC 62776:2014 + COR1:2015) Sicherheitsanforderungen
(IEC 62776:2014 + COR1:2015)

This European Standard was approved by CENELEC on 2015-01-15. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 62776:2015 E
---------------------- Page: 3 ----------------------
SIST EN 62776:2015
EN 62776:2015 - 2 -
Foreword

The text of document 34A/1795/FDIS, future edition 1 of IEC 62776 + corrigendum March 2015,

prepared by SC 34A "Lamps" of IEC/TC 34 "Lamps and related equipment" was submitted to the

IEC-CENELEC parallel vote and approved by CENELEC as EN 62776:2015.
The following dates are fixed:
• latest date by which the document has to be
(dop) 2015-10-15
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national
(dow) 2018-01-15
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.

This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment

Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC).
Endorsement notice

The text of the International Standard IEC 62776:2014 + corrigendum March 2015 was approved by

CENELEC as a European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60529:1989 NOTE Harmonized as EN 60529:1991 (not modified).
IEC 60529:1989/A1:1999 NOTE Harmonized as EN 60529:1991/A1:2000 (not modified).
IEC 60529:1989/A2:2013 NOTE Harmonized as EN 60529:1991/A2:2013 (not modified).
IEC 62471 NOTE Harmonized as EN 62471.
---------------------- Page: 4 ----------------------
SIST EN 62776:2015
- 3 - EN 62776:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 When an international publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu
Publication Year Title EN/HD Year
IEC 60061-1 - Lamp caps and holders together with EN 60061-1 -
gauges for the control of
interchangeability and safety -
Part 1: Lamp caps
IEC 60061-3 - Lamp caps and holders together with EN 60061-3 -
gauges for the control of
interchangeability and safety -
Part 3: Gauges
IEC 60061-4 - Lamp caps and holders together with EN 60061-4 -
gauges for the control of
interchangeability and safety -
Part 4: Guidelines and general
information
IEC 60081 - Double-capped fluorescent lamps - EN 60081 -
Performance specifications
IEC 60155 - Glow-starters for fluorescent lamps EN 60155 -
IEC 60360 - Standard method of measurement of EN 60360 -
lamp cap temperature rise
- -
IEC 60417-DB - Graphical symbols for use on equipment
IEC 60598-1 - Luminaires - EN 60598-1 -
Part 1: General requirements and tests
IEC 60695-2-10 2013 Fire hazard testing - EN 60695-2-10 2013
Part 2-10: Glowing/hot-wire based test
methods - Glow-wire apparatus and
common test procedure
IEC 60695-2-11 2000 Fire hazard testing - EN 60695-2-11
2001
+ corr. January 2001 Part 2-11: Glowing/hot-wire based test
methods - Glow-wire flammability test
method for end-products
———————
Superseded by EN 60695-2-11:2014 (IEC 60695-2-11:2014): DOW = 2017-03-13.
---------------------- Page: 5 ----------------------
SIST EN 62776:2015
EN 62776:2015 - 4 -
Publication Year Title EN/HD Year
IEC 60921 - Ballasts for tubular fluorescent lamps - EN 60921 -
Performance requirements
IEC 61195 - Double-capped fluorescent lamps - EN 61195 -
Safety specifications
IEC 61347-1 2015 Lamp controlgear - EN 61347-1
201X
Part 1: General and safety requirements
IEC 61347-2-8 - Lamp controlgear - EN 61347-2-8 -
Part 2-8: Particular requirements for
ballasts for fluorescent lamps
IEC 62031 - LED modules for general lighting - Safety EN 62031 -
specifications
IEC 62504 - General lighting - Light emitting diode EN 62504 -
(LED) products and related equipment -
Terms and definitions
IEC/TR 62778 - Application of IEC 62471 for the - -
assessment of blue light hazard to light
sources and luminaires
ISO 4046-4 Paper, board, pulps and related terms - - -
2002
Vocabulary -
Part 4: Paper and board grades and
converted products
———————
To be published.
Withdrawn publication.
---------------------- Page: 6 ----------------------
SIST EN 62776:2015
IEC 62776
Edition 1.0 2014-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Double-capped LED lamps designed to retrofit linear fluorescent lamps – Safety
specifications
Lampes à LED à deux culots conçues pour remplacer des lampes à fluorescence
linéaires – Spécifications de sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 29.140.99 ISBN 978-2-8322-1939-3

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: 7 ----------------------
SIST EN 62776:2015
– 2 – IEC 62776:2014 © IEC 2014
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 General requirements and general test requirements ....................................................... 9

5 Marking ......................................................................................................................... 10

5.1 Marking on the lamp ............................................................................................. 10

5.2 Marking on the lamp, on the immediate lamp wrapping (or container) or in

the instructions ..................................................................................................... 12

5.3 Instruction manual ................................................................................................ 12

5.3.1 General ......................................................................................................... 12

5.3.2 Declaration of the product .............................................................................. 12

5.3.3 Graphical instruction ...................................................................................... 13

5.3.4 Mounting ....................................................................................................... 13

5.4 Compliance ........................................................................................................... 13

6 Interchangeability .......................................................................................................... 14

6.1 Interchangeability of the cap ................................................................................. 14

6.2 Mass ..................................................................................................................... 14

6.3 Dimensions ........................................................................................................... 14

6.3.1 Requirements ................................................................................................ 14

6.3.2 Dimensions at 25 °C (non-operating) ............................................................. 14

6.3.3 Variation of dimension A due to self-heating at 25 °C .................................... 15

6.3.4 Dimension B at minimum ambient temperature .............................................. 15

6.3.5 Dimension A at maximum ambient temperature ............................................. 15

6.3.6 Compliance ................................................................................................... 15

6.4 Temperature ......................................................................................................... 15

6.4.1 Temperature requirement .............................................................................. 15

6.4.2 Power requirement ........................................................................................ 16

6.4.3 Compliance ................................................................................................... 16

6.5 Safety of the lamp in case a wrong starter-lamp combination is used .................... 16

7 Pin-safety during insertion ............................................................................................. 16

8 Protection against accidental contact with live parts ...................................................... 17

8.1 General ................................................................................................................. 17

8.2 Test to establish whether a conductive part may cause an electric shock

during operation .................................................................................................... 17

8.3 Insulation resistance ............................................................................................. 19

8.4 Electric strength .................................................................................................... 19

9 Mechanical requirements for caps ................................................................................. 19

9.1 Construction and assembly ................................................................................... 19

9.2 Torque test on unused lamps ................................................................................ 19

9.3 Torque test after heat treatment ............................................................................ 20

9.4 Repetition of 8.2 ................................................................................................... 20

10 Cap temperature rise ..................................................................................................... 20

11 Resistance to heat ......................................................................................................... 21

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SIST EN 62776:2015
IEC 62776:2014 © IEC 2014 – 3 –

12 Resistance to flame and ignition .................................................................................... 22

13 Fault conditions ............................................................................................................. 22

13.1 General ................................................................................................................. 22

13.2 Testing under extreme electrical conditions .......................................................... 22

13.3 Short-circuit across capacitors .............................................................................. 23

13.4 Fault conditions across electronic components ..................................................... 23

13.5 Compliance ........................................................................................................... 23

13.6 Further requirements ............................................................................................ 24

13.7 Safety of the lamp with different types of controlgear ............................................ 24

13.8 Compliance for test with different types of controlgear .......................................... 25

13.9 Safety of the lamp in case the luminaire controlgear short circuits ........................ 25

14 Creepage distances and clearances .............................................................................. 25

15 Lamp with protection against dust and moisture ............................................................ 25

15.1 Aim of the test ...................................................................................................... 25

15.2 Thermal endurance ............................................................................................... 26

15.3 IP testing .............................................................................................................. 26

16 Photobiological hazard .................................................................................................. 26

16.1 UV radiation .......................................................................................................... 26

16.2 Blue light hazard ................................................................................................... 26

16.3 Infrared radiation .................................................................................................. 26

Annex A (informative) Conformity testing during manufacture .............................................. 27

A.1 Background and recommended procedure ............................................................ 27

A.2 Testing ................................................................................................................. 27

Bibliography .......................................................................................................................... 28

Figure 1 – Lamp suitable for high frequency operation .......................................................... 10

Figure 2 – Lamp suitable for 50 Hz or 60 Hz operation .......................................................... 11

Figure 3 – Lamp not suitable for emergency operation .......................................................... 11

Figure 4 – LED replacement starter ...................................................................................... 11

Figure 5 – Lamp to be used in dry conditions or in a luminaire that provides protection ....... 12

Figure 6 – Dimming not allowed ............................................................................................ 12

Figure 7 – Schematic steps of removing a fluorescent lamp and inserting a double-

capped LED lamp designed to retrofit linear fluorescent lamp ............................................... 13

Figure 8 – Test configuration for touch current measurement ................................................ 17

Figure 9 – Standard test finger (according to IEC 60529) ...................................................... 18

Figure 10 – Ball-pressure test apparatus............................................................................... 21

Table 1 – Interchangeability gauges and lamp cap dimensions ............................................. 14

Table 2 – Torque values for unused lamps ............................................................................ 20

Table 3 – Torque values after heating treatment ................................................................... 20

Table 4 – Minimum LED lamp impedances ............................................................................ 24

Table A.1 – Minimum values for electrical tests..................................................................... 27

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SIST EN 62776:2015
– 4 – IEC 62776:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DOUBLE-CAPPED LED LAMPS DESIGNED
TO RETROFIT LINEAR FLUORESCENT LAMPS –
SAFETY SPECIFICATIONS
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 62776 has been prepared by subcommittee 34A: Lamps, of IEC of

IEC technical committee 34: Lamps and related equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
34A/1795/FDIS 34A/1816/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.

In this standard, the following print types are used:
---------------------- Page: 10 ----------------------
SIST EN 62776:2015
IEC 62776:2014 © IEC 2014 – 5 –
– requirements proper: in roman type.
– test specifications: in italic type.
– Notes: in small roman type.

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.
The contents of the corrigendum of March 2015 have been included in this copy.
---------------------- Page: 11 ----------------------
SIST EN 62776:2015
– 6 – IEC 62776:2014 © IEC 2014
INTRODUCTION

Double-capped fluorescent lamps are installed in big volume in office lighting, street lighting,

industrial lighting and much more. Double-capped LED lamps are intended as a possible

replacement for G5- or G13-capped fluorescent lamps. This standard safeguards that the

change from fluorescent lamp to LED lamp and the backward change from LED lamp to

fluorescent lamp is carried out with safe LED lamps and under specified exchange conditions.

The establishing of a safety standard for double-capped LED lamps does not exclude future

relocation as a part of IEC 60968, self-ballasted lamps (if re-edited as an umbrella standard),

and further inclusion of requirements for conversion type double-capped LED lamps.

This proposal covers double-capped LED lamps with cap G5 and G13 only, where the

fluorescent tube is replaced by a tubular LED lamp, without modifications to the luminaire.

Only in case of electromagnetic controlgear, the starter is replaced by a LED starter.

---------------------- Page: 12 ----------------------
SIST EN 62776:2015
IEC 62776:2014 © IEC 2014 – 7 –
DOUBLE-CAPPED LED LAMPS DESIGNED
TO RETROFIT LINEAR FLUORESCENT LAMPS –
SAFETY SPECIFICATIONS
1 Scope

This International Standard specifies the safety and interchangeability requirements, and the

exchange operation together with the test methods and conditions required to show

compliance of double-capped LED lamps with G5 and G13 caps, intended for replacing

fluorescent lamps with the same caps, having:
– a rated power up to 125 W;
– a rated voltage of up to 250 V.

Such LED lamps are designed for replacement without requiring any internal modification of

the luminaire.

The existing luminaires, into which the double-capped LED lamps are fitted, can be operated

with electromagnetic or electronic controlgear.
The requirements of this standard relate only to type testing.
Recommendations for whole product testing or batch testing are given in Annex A.

NOTE 1 Where in this standard the term “lamp(s)” is used, it is understood to stand for “double-capped retrofit

LED lamp(s)”, except where it is obviously assigned to other types of lamps.

This standard does not cover double-capped conversion LED lamps where modification in the

luminaire is required. The requirements in this standard are given for general lighting service

(excluding for example explosive atmospheres). For lamps for other applications additional

requirements may apply.
NOTE 2 This standard includes photobiological safety.
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 60061-1, Lamp caps and holders together with gauges for the control of
interchangeability and safety – Part 1: Lamp caps
IEC 60061-3, Lamp caps and holders together with gauges for the control of
interchangeability and safety – Part 3: Gauges
IEC 60061-4, Lamp caps and holders together with gauges for the control of
interchangeability and safety – Part 4: Guidelines and general information
IEC 60081, Double-capped fluorescent lamps – Performance specifications
IEC 60155, Glow-starters for fluorescent lamps
---------------------- Page: 13 ----------------------
SIST EN 62776:2015
– 8 – IEC 62776:2014 © IEC 2014
IEC 60360, Standard method of measurement of lamp cap temperature rise

IEC 60417, Graphical symbols for use on equipment (available at http://www.graphical-

symbols.info/equipment)
IEC 60598-1, Luminaires – Part 1: General requirements and tests

IEC 60695-2-10:2013, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods;

Glow-wire apparatus and common test procedure

IEC 60695-2-11:2000 , Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods

– Glow-wire flammability test method for end products
IEC 60921, Ballasts for tubular fluorescent lamps – Performance requirements
IEC 61195, Double-capped fluorescent lamps – Safety specifications
IEC 61347-1:— , Lamp controlgear – Part 1: General and safety requirements

IEC 61347-2-8, Lamp controlgear – Part 2-8: Particular requirements for ballasts for

fluorescent lamps
IEC 62031, LED modules for general lighting – Safety specifications

IEC 62504, General lighting - Light emitting diode (LED) products and related equipment -

Terms and definitions

IEC TR 62778, Application of IEC 62471 for the assessment of blue light hazard to light

sources and luminaires

ISO 4046-4:2002, Paper, board, pulps and related terms – Vocabulary – Part 4: Paper and

board grades and converted products
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62504, IEC 62031

as well as the following apply.
3.1
double-capped retrofit LED lamp

tubular LED lamp which can be used as a replacement for double-capped fluorescent lamps

without requiring any internal modification in the luminaire and which, after installation,

maintains the same level of safety of the replaced lamp in the luminaire

Note 1 to entry: The replacement of a glow starter according to IEC 60155 with LED replacement starter having

the same dimensions and fit, for the correct functioning of the double-capped LED lamp is not considered as a

modification to the luminaire.
___________

First edition. This edition has been replaced in 2014 by IEC 60695-2-11:2014, Fire hazard testing - Part 2-11:

Glowing/hot-wire based test methods - Glow-wire flammability test method for end-products (GWEPT)

To be published.
---------------------- Page: 14 ----------------------
SIST EN 62776:2015
IEC 62776:2014 © IEC 2014 – 9 –
3.2
double-capped conversion LED lamp

double-capped LED lamp which can be used as a replacement for another type of lamp with

modification to the luminaire
3.3
rated voltage
voltage value for a characteristic of a lamp for specified operating conditions

Note 1 to entry: The value and the conditions are specified in this standard, or assigned by the manufacturer or

responsible vendor.
3.4
rated power
power marked on the lamp
3.5
rated frequency
frequency mark
...

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