ISO 6742-1:2023

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

This document is applicable to lighting devices used on cycles intended to be used on public roads and, especially, bicycles complying with ISO 4210[1] and ISO 8098[2]. This document 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 rétroréfléchissants — Partie 1: Équipements de signalisation et d'éclairage

General Information

• Status: Published
• Publication Date: 31-Aug-2023
• 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: 6060 - International Standard published
• Start Date: 31-Aug-2023
• Due Date: 10-Feb-2024
• Completion Date: 01-Sep-2023

Relations

• Revises: ISO 6742-1:2015 - Cycles — Lighting and retro-reflective devices — Part 1: Lighting and light signalling devices
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6742-1
Fourth edition
2023-08
Cycles — Lighting and retro-reflective
devices —
Part 1:
Lighting and light signalling devices
Cycles — Éclairage et dispositifs rétroréfléchissants —
Partie 1: Équipements de signalisation et d'éclairage
Reference number
ISO 6742-1:2023(E)
© ISO 2023

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ISO 6742-1:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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.
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Published in Switzerland
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ISO 6742-1:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4 Photometrical requirements . 3
4.1 General . 3
4.2 Front position lamp . 3
4.2.1 Photometric requirements . 3
4.2.2 Mode of illumination . 4
4.3 Rear lamp . 4
4.3.1 Photometric requirements . 4
4.3.2 Mode of illumination . 5
4.4 Stop lamp . 5
4.4.1 Photometric requirements . 5
4.4.2 Mode of illumination . 6
4.5 Low beam . 7
4.5.1 Photometric requirements . 7
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 . 9
4.7.1 Photometric requirements . 9
4.7.2 Mode of illumination . 10
4.8 Stand light . 10
4.8.1 Photometric requirements . 10
4.8.2 Mode of illumination . 11
4.9 Daytime running lamp . 11
4.9.1 Photometric requirements . 11
4.9.2 Mode of illumination .12
4.9.3 Additional requirements .12
5 Colour requirements .12
6 Test methods .13
6.1 General .13
6.2 Power supply and light source to test photometrical performances .13
6.3 Installation on test bench . 14
6.4 Measuring of stop lamp activation and deactivation time . 14
6.4.1 Test preparation and test conditions . 14
6.4.2 Activation time. 14
6.4.3 Deactivation time . 14
Annex A (normative)  Measurement of flashing light .15
Annex B (normative)  Colour of the light emitted .17
Annex C (informative) Current source .18
Bibliography .19
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ISO 6742-1:2023(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 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.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
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 fourth edition cancels and replaces the third edition (ISO 6742-1:2015), which has been technically
revised.
The main changes are as follows:
— terms and definitions: “continuous light” and “light emitting surface” were added;
— some terms and definitions were reviewed;
— improvement of Clause 4;
— addition of Table 3 in 4.4.2;
— addition of 4.9 “Daytime running lamp”;
— addition of 6.4;
— addition of Annex C.
A list of all parts in the ISO 6742 series can be found on the ISO website.
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 6742-1:2023(E)
Cycles — Lighting and retro-reflective devices —
Part 1:
Lighting and light signalling devices
1 Scope
This document is applicable to lighting devices 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 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 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 6742-4, Cycles — Lighting and retro-reflective devices — Part 4: Lighting systems powered by the
cycle’s movement
ISO 6742-5, Cycles — Lighting and retro-reflective devices — Part 5: Lighting systems not powered by the
cycle’s movement
ISO/CIE 19476, Characterization of the performance of illuminance meters and luminance meters
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.
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
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
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ISO 6742-1:2023(E)
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 cycles
3.7
direction indicator
lamp 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
daytime running lamp
lamp facing in forward direction used to make the cycle more easily visible when driving during
daytime
3.10
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
3.11
H-H line
horizontal line parallel to the ground plane passing through the reference axis (3.10)
3.12
V-V line
vertical line perpendicular to the ground plane through the reference axis (3.10)
3.13
public road
any designated and adopted road, pavement, path, or track on which a cycle is legally permitted to
travel and, on most through not all such public roads, cycles will share use with other forms of transport
including motorized traffic
[SOURCE: ISO 4210-1:2023, 3.3.3, modified — "bicycle" has been changed to "cycle".]
3.14
short pulse
light flash shorter than 0,2 s
3.15
light source
source of illumination
Note 1 to entry: For example, light bulbs, LEDs and OLEDs.
3.16
continuous light
light with a frequency above 50 Hz
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ISO 6742-1:2023(E)
3.17
light emitting surface
all or part of the exterior surface of the transparent lens that encloses the lighting and light signalling
devices and conforms to certain defined photometric and colourimetric conditions
[4]
Note 1 to entry: UN/ECE Regulation No.48 shows examples.
[3]
[SOURCE: ISO 12509:2023 , 3.1.12, modified —Note 1 to entry added.]
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 shall meet at least the lowest minimum percentage value
being shown on the grid lines surrounding the questioned direction.
Illuminance and luminance meters shall be calibrated in accordance with ISO/CIE 19476 or equivalent
standard.
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 Luminous intensity
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
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ISO 6742-1:2023(E)
Key
B, B', C, C', dots indicating areas in Table 1
E, E', F and F'
H-H H-H line (See 3.11)
V-V V-V line (See 3.12)
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.
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 Luminous intensity
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
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ISO 6742-1:2023(E)
Key
A intersection of horizontal plane and vertical plane (See Table 2)
H-H H-H line (See 3.11)
V-V V-V line (See 3.12)
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 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.
4.4 Stop lamp
4.4.1 Photometric requirements
The minimum intensity measured on the reference axis at point H = V = 0° of a stop lamp shall be the
highest of the following two values, as appropriate:
— 40 cd min;
— where a stop lam
...