ISO 6742-4:2015

INTERNATIONAL ISO
STANDARD 6742-4
First edition
2015-05-15
Cycles — Lighting and retro-
reflective devices —
Part 4:
Lighting systems powered by the
cycle’s movement
Cycles — Dispositifs d’éclairage et dispositifs rétroréfléchissants —
Partie 4: Systèmes d’éclairage alimentés par dynamo
Reference number
ISO 6742-4:2015(E)
©
ISO 2015

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ISO 6742-4:2015(E)

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© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

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ISO 6742-4:2015(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Lamps and interchangeable generators . 2
4.1 General . 2
4.2 Requirements . 2
4.2.1 Dynamo-operated front lights . 2
4.2.2 Dynamo-operated rear lights . 2
4.2.3 Dynamos . 3
4.3 Test Methods . 4
4.3.1 Dynamo-operated front lights . 4
4.3.2 Dynamo-operated rear lights . 4
4.3.3 Dynamos . 4
5 Lamps and dedicated generators . 5
5.1 General . 5
5.2 Requirements . 5
5.2.1 Principle of lighting system . 5
5.2.2 Speed ranges . 5
5.3 Safety requirements . 5
5.3.1 Environmental behaviour . 5
5.3.2 Test method . 6
6 Common requirements and test methods for lighting systems and the loading .6
6.1 Requirements . 6
6.1.1 Corrosion resistance . 6
6.1.2 Water resistance . . . 6
6.1.3 Loading requirements . 6
6.2 Test methods . 6
6.2.1 Corrosion testing . 6
6.2.2 Water resistance . . . 6
6.2.3 Test of electronic load. 6
7 Instructions . 7
8 Marking . 7
8.1 Requirement . 7
8.2 Durability test . 7
8.2.1 Requirement . 7
8.2.2 Test method . 7
Annex A (informative) Electronic load for power-measurement of 6 V/1,5 W LED dynamos .8
Annex B (informative) Efficiency calculation .10
Annex C (informative) Verification of the electronic load .11
Bibliography .13
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ISO 6742-4:2015(E)

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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT), see the following URL: Foreword — Supplementary information.
The committee responsible for this document is ISO/TC 149, Cycles, SC 1, Cycles and major sub-assemblies.
ISO 6742 consists of the following parts, under the general title Cycles — Lighting and retro-reflective devices:
— Part 1: Lighting and light signalling devices
— Part 2: Retro reflective devices
— Part 3: Installation and use of lighting and retro-reflective devices
— Part 4: Lighting systems powered by the cycle’s movement
— Part 5: Lighting systems not powered by the cycle’s movement
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INTERNATIONAL STANDARD ISO 6742-4:2015(E)
Cycles — Lighting and retro-reflective devices —
Part 4:
Lighting systems powered by the cycle’s movement
1 Scope
This part of ISO 6742 is applicable to lighting systems used on cycles intended to be used on public roads
and, especially, bicycles complying with ISO 4210 and ISO 8098.
This part of ISO 6742 specifies requirements and test methods for the performance of lighting systems
powered by the cycle’s movement. It applies to light devices complying with ISO 6742-1. Lighting systems
include lighting devices and power supplied by cycle’s movement such as generator.
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.
ISO 6742-1:2015, Cycles — Lighting and retro-reflective devices — Part 1: Lighting and light signalling devices
ISO 6742-3:2015, 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.
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
generators which are not concerned by the definition of frictional drive generator (3.1)
3.3
integrated lamp and power source
system including power source and at least one type of light designed to be used together, closed system
Note 1 to entry: Power generator characteristics are depending of vehicle movement.
Note 2 to entry: Light output performances are depending of the speed of the vehicle, or the time during which
bicycle has been stopped.
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ISO 6742-4:2015(E)

4 Lamps and interchangeable generators
4.1 General
The complete system shall be designed as open system which requires compatibility between lamps
and generators.
4.2 Requirements
4.2.1 Dynamo-operated front lights
Dynamo-operated front lights (lamps emitting light to the front) shall correspond with the requirements
of ISO 6742-1:2015, 4.2 (Front position lamp), 4.5 (Low beam) and 4.6 (High beam).
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 .
eff
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;
eff
— the lighting evaluation shall be performed at test voltage;
— the power consumption shall be ≤110 % 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 6742-1:2015, 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 dynamo 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 emit visible light for at least 240 s.
4.2.2 Dynamo-operated rear lights
Dynamo-operated rear lights (lamps emitting light to the rear) shall correspond with the requirements
of ISO 6742-1:
...