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• Status: Withdrawn
• 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: 9599 - Withdrawal of International Standard
• Completion Date: 01-Sep-2023

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
• Revised: ISO 6742-1:2023 - 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
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

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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

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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.
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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.
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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.
4
...

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

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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
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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

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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
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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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