ISO 6742-1:2015

Cycles — Lighting and retro-reflective devices — Part 1: Lighting and light signalling devices

ISO 6742-1:2015 is applicable to lighting devices used on cycles intended to be used on public roads and, especially, bicycles complying with ISO 4210 and ISO 8098. ISO 6742-1:2015 specifies the functions, safety requirements, photometric performance and test methods of lighting and signalling devices that can be used on cycles.

Cycles — Éclairage et dispositifs rétro-réfléchissants — Partie 1: Équipements de signalisation et d'éclairage

General Information

• Status: Published
• Publication Date: 26-May-2015
• ICS: 43.150 - Cycles
• Technical Committee: ISO/TC 149/SC 1 - Cycles and major sub-assemblies
• Drafting Committee: ISO/TC 149/SC 1 - Cycles and major sub-assemblies
• Current Stage: 9092 - International Standard to be revised
• Completion Date: 10-Feb-2021

Relations

• Revises: ISO 6742-1:1987 - Cycles — Lighting and retro-reflective devices — Photometric and physical requirements — Part 1: Lighting equipment
• Effective Date: 13-Sep-2009

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6742-1
Redline version
compares Third edition to
Second edition
Cycles — Lighting and retro-
reflective devices —
Part 1:
Lighting and light signalling devices
Cycles — Éclairage et dispositifs rétro-réfléchissants —
Partie 1: Équipements de signalisation et d’éclairage
Reference number
ISO 6742-1:redline:2015(E)
ISO 2015
---------------------- Page: 1 ----------------------
ISO 6742-1:redline:2015(E)
IMPORTANT — PLEASE NOTE
This is a mark-up copy and uses the following colour coding:
Text example 1 — indicates added text (in green)
— indicates removed text (in red)
Text example 2
— indicates added graphic figure
— indicates removed graphic figure
1.x ... — Heading numbers containg modifications are highlighted in yellow in
the Table of Contents

All changes in this document have yet to reach concensus by vote and as such should only

be used internally for review purposes.
DISCLAIMER

This Redline version provides you with a quick and easy way to compare the main changes

between this edition of the standard and its previous edition. It doesn’t capture all single

changes such as punctuation but highlights the modifications providing customers with

the most valuable information. Therefore it is important to note that this Redline version is

not the official ISO standard and that the users must consult with the clean version of the

standard, which is the official standard, for implementation purposes.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6742-1:redline:2015(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

0 Introduction .............................................................................................................................................................................................................. 1

1 Scope ................................................................................................................................................................................................................................. 1

2 1 Field of application Scope ............................................................................................................................................................................ 1

3 2 References Normative references........................................................................................................................................................ 1

4 3 Definitions Terms and definitions ...................................................................................................................................................... 2

5 4 Photometric requirements for headlamps Photometrical requirements .................................................3

4.1 General ........................................................................................................................................................................................................... 3

4.2 Front position lamp ............................................................................................................................................................................ 4

4.2.1 Photometric requirements ...................................................................................................................................... 4

4.2.2 Mode of illumination .................................................................................................................................................... 4

4.3 Rear lamp ..................................................................................................................................................................................................... 5

4.3.1 Photometric requirements ...................................................................................................................................... 5

4.3.2 Mode of illumination .................................................................................................................................................... 5

4.4 Stop lamp ..................................................................................................................................................................................................... 6

4.4.1 Photometric requirements ...................................................................................................................................... 6

4.4.2 Mode of illumination .................................................................................................................................................... 7

4.5 Low beam .................................................................................................................................................................................................... 7

4.5.1 Photometric requirements ...................................................................................................................................... 7

4.5.2 Mode of illumination .................................................................................................................................................... 9

4.6 High beam ................................................................................................................................................................................................... 9

4.6.1 Photometric requirements ...................................................................................................................................... 9

4.6.2 Mode of illumination .................................................................................................................................................10

4.6.3 Additional requirements ........................................................................................................................................10

5.1 4.7 Luminous intensity Direction indicators ........................................................................................................................11

5.1.1 4.7.1 ......................................................................................................................................................

Values of luminous intensity Photometric requirements ...........................................................11

5.1.2 Unit for test ........................................................................................................................................................................12

5.1.3 4.7.2 ......................................................................................................................................................

Test measurements Mode of illumination ...............................................................................................13

5.2 4.8 Colour of light from headlamp Stand light ....................................................................................................................13

5.2.1 White light ..........................................................................................................................................................................13

5.2.2 4.8.1 ......................................................................................................................................................

Selective yellow light Photometric requirements .............................................................................13

5.2.3 4.8.2 ......................................................................................................................................................

Visual comparison Mode of illumination ..................................................................................................13

5 Colour requirements .....................................................................................................................................................................................13

6 Photometric requirements for rear lamps Test methods ........................................................................................14

6.1 General ........................................................................................................................................................................................................14

6.1 6.2 Luminous intensity Power supply and light source to test photometrical performances ..14

6.1.1 Values of luminous intensity ..............................................................................................................................14

6.1.2 Unit for test ........................................................................................................................................................................15

6.1.3 Test measurements .....................................................................................................................................................16

6.2 6.3 Colour of light from rear lamp Installation on test bench ...............................................................................16

6.2.1 Red light ...................................................................... ..........................................................................................................16

6.2.2 Visual comparison .......................................................................................................................................................16

7 Generators................................................................................................................................................................................................................17

7.1 Output characteristics ...................................................................................................................................................................17

7.2 Maintenance of generator output ........................................................................................................................................17

8 Batteries .....................................................................................................................................................................................................................17

8.1 Primary batteries ...............................................................................................................................................................................17

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ISO 6742-1:redline:2015(E)

8.1.1 Specification ...................................................................... ................................................................................................17

8.1.2 Maintenance of luminous intensity ..............................................................................................................17

8.1.3 Test method .......................................................................................................................................................................18

8.2 Secondary batteries .........................................................................................................................................................................18

8.2.1 Specification ...................................................................... ................................................................................................18

8.2.2 Maintenance of luminous intensity ..............................................................................................................18

8.2.3 Test method .......................................................................................................................................................................18

9 Switch performance (where applicable) ..................................................................................................................................19

10 Environmental tests .......................................................................................................................................................................................19

10.1 General ........................................................................................................................................................................................................19

10.2 Vibration resistance test for head and rear lamps ................................................................................................19

10.2.1 Requirements ..................................................................................................................................................................19

10.2.2 Test method .......................................................................................................................................................................19

10.3 Temperature test for head and rear lamps ..................................................................................................................20

10.3.1 Requirements ..................................................................................................................................................................20

10.3.2 Test method .......................................................................................................................................................................20

10.4 Temperature test for generator .............................................................................................................................................20

10.4.1 Requirements ..................................................................................................................................................................20

10.4.2 Test method .......................................................................................................................................................................20

10.5 Moisture resistance test for lamps and generator ................................................................................................20

10.5.1 Requirements ..................................................................................................................................................................20

10.5.2 Test method .......................................................................................................................................................................20

10.6 Corrosion resistance test for lamps and generator ..............................................................................................21

10.6.1 Requirement and test method ..........................................................................................................................21

10.6.2 Duration of test ..............................................................................................................................................................21

10.7 Fuel resistance test for head and rear lamps .............................................................................................................21

10.7.1 Requirements ..................................................................................................................................................................21

10.7.2 Test method .......................................................................................................................................................................21

11 Marking .......................................................................................................................................................................................................................21

11.1 Headlamps and rear lamps ........................................................................................................................................................21

11.2 Generators ...............................................................................................................................................................................................21

11.3 Secondary battery systems .......................................................................................................................................................22

12 Instructions .............................................................................................................................................................................................................22

Annex A (informative) Typical filament lamps Measurement of flashing light .....................................................23

Annex B (normative) Vibration test machine Colour of the light emitted...................................................................30

Bibliography .............................................................................................................................................................................................................................32

iv © ISO 2015 – All rights reserved
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ISO 6742-1:redline: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.

Draft International Standards adopted by the technical committees are circulated to the member

bodies for approval before their acceptance as International Standards by the ISO Council. They are

approvedThe 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

ISO procedures requiring at least 75 % approval by the member bodies votingthe 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.

International StandardThe committee ISO 6742-1 was prepared by Technical Committeeresponsible for

this document is ISO/TC 149, Cycles, SC 1, Cycles and major sub-assemblies.

This secondthird edition cancels and replaces the firstsecond edition (ISO 6742-1: 19851987), of

which it constitutes a technical revision incorporating draft Amendment which has been technically

revisedISO 6742-1/DAM 1 : 1986 which, in addition to a revision of clauses 8.1.2 and 8.1.3, includes new

definition 4.12 and new clauses 8.2.2, 8.2.3, 11.3 and 12.

UsersISO 6742 should note that all International Standards undergo revision fromconsists of the

following parts, under the general title time to time and that any Cycles — Lighting and retro-reflective

devicesreference made herein to any other International Standard implies its latest edition, unless

otherwise stated. :
— 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
© ISO 2015 – All rights reserved v
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INTERNATIONAL STANDARD ISO 6742-1:redline:2015(E)
Cycles — Lighting and retro-reflective devices —
Part 1:
Lighting and light signalling devices
0 Introduction

This part of ISO 6742 has been prepared in order to specify photometric and physical requirements for

lighting and retroreflective devices for cycles intended for use on public roads.

The provision of such equipment is intended to make other road users aware of the presence of cyclists,

especially under conditions of poor visibility or at night. In addition, headlamps made in conformity

with the requirements of this part of ISO 6742 will provide sufficient lighting to enable cyclists at night

to detect road conditions immediately ahead and, if necessary, to take action to avoid potential hazards.

ISO 6742-2 gives requirements for retro-reflective devices.

Annex A is included to give characteristics of typical filament lamps that are suitable for headlamps and rear

lamps (for production and test purposes). However, cycle filament lamps will form the subject of a future

IEC Standard, on publication of which annex A will be withdrawn and reference made to that standard.

Annex B describes a suitable vibration test machine.
1 Scope

This part of ISO 6742 specifies photometric and physical requirements, test methods, and marking

requirements for lighting equipment for cycles.
2 1 Field of application Scope

This part of the ISO 6742 applies to lighting equipment for useis applicable to lighting devices used on

cycles intended to be used on public roads and, in particular, for use onespecially, bicycles complying

with ISO 4210 and ISO 8098.

This part of ISO 6742 specifies the functions, safety requirements, photometric performance and test

methods of lighting and signalling devices that can be used on cycles.
3 2 References 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 3768 6742-4:2015, Metallic coatings — Neutral salt spray test (NSS test). Cycles — Lighting and retro-

reflective devices — Part 4: Lighting systems powered by the cycle’s movement

ISO 4210 6742-5:2015, Cycles — Safety requirements of bicycles.  — Lighting and retro-reflective devices —

Part 5: Lighting systems not powered by the cycle’s movement

CIE Publication No. 15  1931, Colorimetry, Official CIE ( XYZ colour space of the International Commission on

Illumination) recommendations.

IEC Publication 61, Lamp caps and holders together with gauges for the control of interchangeability and safety.

© ISO 2015 – All rights reserved 1
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ISO 6742-1:redline:2015(E)
IEC Publication 86, Primary batteries.

IEC Publication 285, Sealed nickel-cadmium cylindrical rechargeable single cells.

4 3 Definitions Terms and definitions

For the purposes of this part of documentISO 6742, the following terms and definitions apply.

3.1
front position lamp

lamp emitting a white or an amber light to the front of the cycle, so as to indicate its presence on the road

3.2
headlamp

lamp to light the road to the front of the cycle that has either low beam, high beam or both

3.3
rear lamp

lamp emitting a red light to the rear of the cycle and used to indicate its presence on the road

3.4
stop-lamp

lamp used to indicate to other road users that the cycle brakes or significantly decelerates

3.5
low beam

light that illuminates the road in front of the cycle without dazzling other road users from the

opposite direction
3.6
high beam
light that illuminates the road for a long distance ahead of the vehicle
3.7
direction indicators

lamps used to indicate to other road users that the cyclist intends to change direction to the right or left

3.8
stand-light
light emitted by a lamp for a time after the cycle has stopped
3.9
lamp equipped with replaceable light source

lamp whose light source(s) can be replaced by the user with an equivalent light source(s) of the same type

3.10
lamp equipped with non-replaceable light source

lamp whose light source(s) is permanently fitted, and not designed to be replaced by the user

4.1 3.11
cycle cycles

any vehicle that has at least two wheels and is propelled solely or mainly by the muscular energy of the

person on that vehicle, in particular by means of pedals.
4.2
bicycle
Two-wheeled cycle.
2 © ISO 2015 – All rights reserved
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ISO 6742-1:redline:2015(E)
4.3
headlamp

Lamp that shows a white or selective yellow light to the front of the cycle to indicate its presence on the

road and also to provide additional illumination of the road ahead.
4.4
rear lamp

Lamp that shows a red light to the rear of a cycle and serves to indicate its presence.

4.5
filament lamp

Lamp in which light is produced by means of an element heated to incandescence by the passage of an

electric current.
4.6 3.12
axis of reference reference axis

characteristic horizontal axis of the lamp, as determined by the manufacturer or by the direction light

is emitted with greatest intensity, to serve as a direction of reference during use in service and during

test measurements. (See  figure 1.)
4.7
centre of reference

Intersection of the axis of reference with the light output surface of the lamp. (See figure 1.)

4.8 3.13
beam centre plane HH

As viewed on the test screen, that area at the centre of the light pattern the intensity of which is not

less than 80 % of the maximum intensity,  horizontal plane parallel to the ground passing through the

reference axisI , of the beam.
max
4.9 3.14
rated voltage plane VV
Voltage marked on the filament lamp. vertical plane through the reference axis
4.10
unit for test
Complete unit, including the requisite electrical supply.
4.11 3.15
reference luminous flux  public road

Specified luminous flux of a filament lamp to which the photometric characteristics of a headlamp or

rear lamp shall be referred. any designed and adopted road pavement, path or track on which a bicycle

permitted to travel and on most through not all such public roads, bicycles will share use with other

forms of transport including motorised traffic
4.12 3.16
system  short pulse

Group comprising a headlamp, rear lamp, battery pack and/or generator and interconnecting cable. light

flash shorter than 0,2 s
5 4 Photometric requirements for headlamps Photometrical requirements
4.1 General

If the reference axis is not mentioned by manufacturer, this direction shall be determined by that in

which light is emitted with greatest intensity.
© ISO 2015 – All rights reserved 3
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ISO 6742-1:redline:2015(E)

Within the field of light distribution, schematically shown as a grid, the light intensity in each direction

of a part of the fielded formed by the grid lines meets at least the lowest minimum percentage value

being shown on the grid lines surrounding the questioned direction.
4.2 Front position lamp
4.2.1 Photometric requirements

The requirements of the front position lamp contained below in Table 1 shall correspond to the

illustrative dimensions as shown further below in Figure 1.
Table 1 — Light distribution for front position lamp
Position Value in cd
In area bound by straight lines connecting dots E, C, B, B’, C’, E’ and E ≥4
From E to F and E’ to F’ ≥2
In rectangular area bounded by lines 15°U, 15°D, 80°L and 80°R ≥0,05
Upper limit on the H-H line and above H-H line 140 max
Key
H represents the horizontal plane to the ground through the reference axis
V represents the vertical plane through the reference axis

U and D represent the degrees of arc, respectively, above and below the horizontal plane

L and R represent the degrees of arc, respectively, to the left and right of the vertical plane

Figure 1 — Measuring and aiming screen for front position lamp
4.2.2 Mode of illumination

A front position lamp could either emit a continuous light or flash at a frequency from 1 Hz to 4 Hz. Such

a lamp may be capable of only one mode or be switched between modes.

NOTE Some national or regional regulations do not permit the use of flashing lights on pedal cycles, apart

from direction indicators.
...

INTERNATIONAL ISO
STANDARD 6742-1
Third edition
2015-05-15
Cycles — Lighting and retro-
reflective devices —
Part 1:
Lighting and light signalling devices
Cycles — Éclairage et dispositifs rétro-réfléchissants —
Partie 1: Équipements de signalisation et d’éclairage
Reference number
ISO 6742-1:2015(E)
ISO 2015
---------------------- Page: 1 ----------------------
ISO 6742-1:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6742-1:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Photometrical requirements ................................................................................................................................................................... 2

4.1 General ........................................................................................................................................................................................................... 2

4.2 Front position lamp ............................................................................................................................................................................ 3

4.2.1 Photometric requirements ...................................................................................................................................... 3

4.2.2 Mode of illumination .................................................................................................................................................... 3

4.3 Rear lamp ..................................................................................................................................................................................................... 4

4.3.1 Photometric requirements ...................................................................................................................................... 4

4.3.2 Mode of illumination .................................................................................................................................................... 4

4.4 Stop lamp ..................................................................................................................................................................................................... 5

4.4.1 Photometric requirements ...................................................................................................................................... 5

4.4.2 Mode of illumination .................................................................................................................................................... 6

4.5 Low beam .................................................................................................................................................................................................... 6

4.5.1 Photometric requirements ...................................................................................................................................... 6

4.5.2 Mode of illumination .................................................................................................................................................... 8

4.6 High beam ................................................................................................................................................................................................... 8

4.6.1 Photometric requirements ...................................................................................................................................... 8

4.6.2 Mode of illumination .................................................................................................................................................... 9

4.6.3 Additional requirements ........................................................................................................................................... 9

4.7 Direction indicators .........................................................................................................................................................................10

4.7.1 Photometric requirements ...................................................................................................................................10

4.7.2 Mode of illumination .................................................................................................................................................11

4.8 Stand light ................................................................................................................................................................................................11

4.8.1 Photometric requirements ...................................................................................................................................11

4.8.2 Mode of illumination .................................................................................................................................................12

5 Colour requirements .....................................................................................................................................................................................12

6 Test methods ..........................................................................................................................................................................................................12

6.1 General ........................................................................................................................................................................................................12

6.2 Power supply and light source to test photometrical performances ....................................................13

6.3 Installation on test bench ...........................................................................................................................................................13

Annex A (informative) Measurement of flashing light ....................................................................................................................14

Annex B (normative) Colour of the light emitted .................................................................................................................................16

Bibliography .............................................................................................................................................................................................................................18

© ISO 2015 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 6742-1:2015(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.

This third edition cancels and replaces the second edition (ISO 6742-1:1987), which has been

technically revised.

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
iv © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 6742-1:2015(E)
Cycles — Lighting and retro-reflective devices —
Part 1:
Lighting and light signalling devices
1 Scope

This part of the ISO 6742 is applicable to lighting devices 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 the functions, safety requirements, photometric performance and test

methods of lighting and signalling devices that can be used on cycles.
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 6742-4:2015, Cycles — Lighting and retro-reflective devices — Part 4: Lighting systems powered by the

cycle’s movement

ISO 6742-5:2015, Cycles — Lighting and retro-reflective devices — Part 5: Lighting systems not powered by

the cycle’s movement
CIE 1931, XYZ colour space of the International Commission on Illumination
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
front position lamp

lamp emitting a white or an amber light to the front of the cycle, so as to indicate its presence on the road

3.2
headlamp

lamp to light the road to the front of the cycle that has either low beam, high beam or both

3.3
rear lamp

lamp emitting a red light to the rear of the cycle and used to indicate its presence on the road

3.4
stop-lamp

lamp used to indicate to other road users that the cycle brakes or significantly decelerates

3.5
low beam

light that illuminates the road in front of the cycle without dazzling other road users from the

opposite direction
© ISO 2015 – All rights reserved 1
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ISO 6742-1:2015(E)
3.6
high beam
light that illuminates the road for a long distance ahead of the vehicle
3.7
direction indicators

lamps used to indicate to other road users that the cyclist intends to change direction to the right or left

3.8
stand-light
light emitted by a lamp for a time after the cycle has stopped
3.9
lamp equipped with replaceable light source

lamp whose light source(s) can be replaced by the user with an equivalent light source(s) of the same type

3.10
lamp equipped with non-replaceable light source

lamp whose light source(s) is permanently fitted, and not designed to be replaced by the user

3.11
cycles

any vehicle that has at least two wheels and is propelled solely or mainly by the muscular energy of the

person on that vehicle, in particular by means of pedals
3.12
reference axis

characteristic horizontal axis of the lamp, as determined by the manufacturer or by the direction light

is emitted with greatest intensity, to serve as a direction of reference during use in service and during

test measurements
3.13
plane HH
horizontal plane parallel to the ground passing through the reference axis
3.14
plane VV
vertical plane through the reference axis
3.15
public road

any designed and adopted road pavement, path or track on which a bicycle permitted to travel and on

most through not all such public roads, bicycles will share use with other forms of transport including

motorised traffic
3.16
short pulse
light flash shorter than 0,2 s
4 Photometrical requirements
4.1 General

If the reference axis is not mentioned by manufacturer, this direction shall be determined by that in

which light is emitted with greatest intensity.

Within the field of light distribution, schematically shown as a grid, the light intensity in each direction

of a part of the fielded formed by the grid lines meets at least the lowest minimum percentage value

being shown on the grid lines surrounding the questioned direction.
2 © ISO 2015 – All rights reserved
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ISO 6742-1:2015(E)
4.2 Front position lamp
4.2.1 Photometric requirements

The requirements of the front position lamp contained below in Table 1 shall correspond to the

illustrative dimensions as shown further below in Figure 1.
Table 1 — Light distribution for front position lamp
Position Value in cd
In area bound by straight lines connecting dots E, C, B, B’, ≥4
C’, E’ and E
From E to F and E’ to F’ ≥2
In rectangular area bounded by lines 15°U, 15°D, 80°L and ≥0,05
80°R
Upper limit on the H-H line and above H-H line 140 max
Key
H represents the horizontal plane to the ground through the reference axis
V represents the vertical plane through the reference axis

U and D represent the degrees of arc, respectively, above and below the horizontal plane

L and R represent the degrees of arc, respectively, to the left and right of the vertical plane

Figure 1 — Measuring and aiming screen for front position lamp
4.2.2 Mode of illumination

A front position lamp could either emit a continuous light or flash at a frequency from 1 Hz to 4 Hz. Such

a lamp may be capable of only one mode or be switched between modes.

NOTE Some national or regional regulations do not permit the use of flashing lights on pedal cycles, apart

from direction indicators.
© ISO 2015 – All rights reserved 3
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ISO 6742-1:2015(E)
4.3 Rear lamp
4.3.1 Photometric requirements

The requirements of the rear lamp contained in Table 2 shall correspond to the illustrative dimensions

as shown further below in Figure 2. Rear lamps with a function of the stand light shall correspond with

the requirement of 4.8.
Table 2 — Light distribution for rear lamp
Position Value in cd
A on intersection of horizontal plane and vertical plane ≥ 2,5
In rectangular area bounded by lines 5°U, 5°D, 5°L and 5°R ≥ 1
In rectangular area bounded by lines 10°U, 10°D, 10°L and 10°R ≥ 0,33
In rectangular area bounded by lines 10°U, 10°D, 45°L and 45°R ≥ 0,1
In rectangular area bounded by lines 10°U, 10°D, 110°L and 110°R ≥ 0,033
Upper limit on the H-H line and above H-H line 12 max
Key
H represents the horizontal plane to the ground through the reference axis
V represents the vertical plane through the reference axis

U and D represent the degrees of arc, respectively, above and below the horizontal plane

L and R represent the degrees of arc, respectively, to the left and right of the vertical plane

Figure 2 — Measuring and aiming screen for rear lamp
4.3.2 Mode of illumination
A rear lamp could either emit a continuous li
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