ISO 6742-4:2023

INTERNATIONAL ISO
STANDARD 6742-4
Second edition
2023-08
Cycles — Lighting and retro-reflective
devices —
Part 4:
Lighting systems powered by the
cycle's movement
Cycles — Éclairage et dispositifs rétroréfléchissants —
Partie 4: Systèmes d'éclairage alimentés par dynamo
Reference number
© ISO 2023
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4  Requirements for lighting systems powered by the cycle's movement .2
4.1 General . 2
4.2 Corrosion resistance . 2
4.3 Water resistance . 2
5  Requirements for open system . .2
5.1 General . 2
5.2 Front lights for open system . 2
5.3 Rear lights for open system . 3
5.4 Generators for open system . 4
5.4.1 General characteristics of generators . 4
5.4.2 Frictional drive generator . 4
5.4.3 Positive drive generator . 4
6  Requirements for closed system .5
6.1 General . 5
6.2 Photometrical performance requirement between 5 km/h and 15 km/h . 5
6.3 Photometrical performance requirement 15 km/h or higher . 5
6.4 High speed endurance requirement . 5
7 Test methods . 5
7.1 Corrosion testing for both system . 5
7.2 Water resistance for both system . 5
7.3 Front lights for open system . 5
7.4 Rear lights for open system . 5
7.5 Generators for open system . 6
7.5.1 General characteristics of generators . 6
7.5.2 Frictional drive generators . 6
7.5.3 Positive drive generators . 8
7.6 Test methods for closed system . 9
7.6.1 Power measurement . 9
7.6.2 High speed endurance test . 9
8 Instructions . 9
9 Marking . . 9
9.1 Requirement . 9
9.2 Durability test . 10
9.2.1 Requirement . 10
9.2.2 Test method . 10
Annex A (normative)  Electronic load for power-measurement of LED generators .11
Annex B (informative)  Efficiency calculation .13
Annex C (informative)  Verification of the electronic load .14
Bibliography .16
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO 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, ISO 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 www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
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expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 149, Cycles, Subcommittee SC 1, Cycles
and major sub-assemblies.
This second edition cancels and replaces the first edition (ISO 6742-4:2015), which has been technically
revised.
The main changes are as follows:
— terms and definitions: “open system” and “closed system” were added;
— overall structure changes to clarify requirements and test methods;
— addition of “6 V/3 W with electric load” positive drive generators;
— changes in generator characteristic requirements;
— clarify test methods and improvement of requirements for open systems;
— changes in closed system requirements and test methods;
— improvement of Clause 8;
— improvement of Clause 9;
— improvement of Annex A;
— improvement of Annex B;
— improvement of Annex C.
A list of all parts in the ISO 6742 series can be found on the ISO website.
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Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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INTERNATIONAL STANDARD ISO 6742-4:2023(E)
Cycles — Lighting and retro-reflective devices —
Part 4:
Lighting systems powered by the cycle's movement
1 Scope
This document is applicable to lighting systems used on cycles intended to be used on public roads and,
[1] [2]
especially, bicycles complying with ISO 4210 and ISO 8098 .
This document specifies requirements and test methods for the performance of lighting systems
powered by the cycle’s movement. It applies to lighting and light signalling devices complying with
ISO 6742-1. Lighting systems include lighting and light signalling devices and power supplied by cycle's
movement such as generator.
2  Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
ISO 6742-1:2023, Cycles — Lighting and retro-reflective devices — Part 1: Lighting and light signalling
devices
ISO 6742-3:2023, Cycles — Lighting and retro-reflective devices — Part 3: Installation and use of lighting
and retro-reflective devices
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
IEC 60529, Degrees of protection provided by enclosures (IP Code)
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6742-1 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
frictional drive generator
generator for which the rotor or stator is linked to a pulley which press against the driving wheel over
a swivel bearing through force
3.2
positive drive generator
generator which is not concerned by the definition of frictional drive generator (3.1)
3.3
open system
system of lamp and power source (i.e. generator or battery) combinations which are interchangeable if
they meet the requirements
[3]
Note 1 to entry: The requirements are specified in this document or ISO 6742-5 .
3.4
closed system
system in which lamp and power source (i.e. generator or battery) are integrated, or in which the
combination is specified by the manufacturer.
4  Requirements for lighting systems powered by the cycle's movement
4.1 General
There are two types of lighting systems powered by the cycle's movement: open systems and closed
systems, and they shall meet the respective requirements shown in Table 1.
The requirements shall be met by the maximum and minimum wheel diameters of the cycle intended
for use.
Table 1 — lighting systems powered by the cycle’s movement
Light system Requirement Test method
Both system 4.2 7.1
4.3 7.2
Open system Front lamp 5.2 7.3
Rear lamp 5.3 7.4
Generators 5.4 7.5
Closed system 6 7.6
4.2 Corrosion resistance
All functions of the lighting system shall work after testing in accordance with the test method
described in 7.1.
4.3 Water resistance
All functions of the lighting system shall work after testing in accordance with the test method
described in 7.2.
5  Requirements for open system
5.1 General
The complete system shall be designed as open system which requires compatibility between lamps
and generators.
5.2  Front lights for open system
Front lights for open system (lamps emitting light to the front) shall correspond with the requirements
of ISO 6742-1:2023, 4.2, 4.5, 4.6 and 4.9, when tested in accordance with 7.3.
Voltage limiting resources shall only become effective above the test voltage. Here, the value of the DC
voltage, U, corresponds with the root mean square of the AC voltage, U .
rms
Furthermore:
— the nominal voltage of the light source shall be equal to the system voltage or the light source shall
be powered via an appropriate electronic ballast;
— the lighting effect shall be deployed at 3 U at the latest;
rms
— the lighting evaluation shall be performed at test voltage;
— the power consumption shall be 110 % or less of the nominal value;
— the power consumption shall be 2,4 W or less at the test voltage;
— electronic ballasts in these units shall have the corresponding electrical rating.
Head lamps with integrated capacitor to power the light while halting shall be built so that the load
of the entire equipment on the supply system is not substantially higher than that intended for
this equipment according to ISO 6742-1:2023, 4.8. The entire equipment shall fulfil the necessary
requirements at test voltage, where, based on a discharged capacitor, a charging time of 120 s using test
voltage is permissible and the reduction of the generator voltage through the charging of the capacitor
shall correspond with the following conditions:
a) not exceeding 60 % after 15 s;
b) not exceeding 37 % after 30 s;
c) not exceeding 15 % after 60 s;
d) not exceeding 5 % after 90 s;
e) not exceeding 1,5 % after 120 s.
Any stand light shall
...