Cycles -- Lighting and retro-reflective devices -- Photometric and physical requirements

Cycles -- Éclairage et dispositifs rétroréfléchissants -- Caractéristiques photométriques et physiques

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ISO 6742-2:1984 - Cycles -- Lighting and retro-reflective devices -- Photometric and physical requirements
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International Standard @ 674212


Cycles - Lighting and retro-reflective devices -
Photometric and physical requirements -
Part 2 : Retro-reflective devices

Cycles - Éclairage et dispositifs rétroréfléohissants - Caractéristiques photornétriques et ph piques - Partie 2 : Dispositifs

First edition - 1984-11-15
UDC 629. Ref. No. IS0 6742/2-1984 (E)

Descriptors : road vehicles, bicycles, lighting equipment, reflectors, cats eyes reflectors (vehicles), specifications, photometric properties,

physical properties, colorimetric properties, tests, performance tests, marking
Price based on 8 pages
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IS0 (the International Organization for Standardization) is a worldwide federation of

national standards bodies (IS0 member bodies). The work of preparing International

IS0 technical committees. Each member
Standards is normally carried out through

body interested in a subject for which a technical committee has been established has

the right to be represented on that committee. International organizations, govern-

mental and non-governmental, in liaison with ISO, also take part in the work.

Draft International Standards adopted by the technical committees are circulated to

the member bodies for approval before their acceptance as International Standards by

the IS0 Council. They are approved in accordance with IS0 procedures requiring at

least 75 % approval by the member bodies voting.
International Standard IS0 6742/2 was prepared by Technical Committee
ISO/TC 149, Cycles. It incorporates draft Addendum 1 (clause 11 1.
O International Organization for Standardization, 1984 0
Printed in Switzerland
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Contents Page
Introduction ......................................................... 1
1 Scope and field of applic ................... 1
References .................... .............................
2 1
Definitions ........... .............................
3 1
4 ...................................... 2
Symbols and units used .
Photometric requirements ............................................. 3
Colorimetric requirements ...... ... ............................ 4
Physical requirements . . ........................................ 5
8 Photometric test for reflectors ........................
9 Photometric test for retro-reflective tyres ........
......... 8
10 .............................
11 .........................................
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Cycles - Lighting and retro-reflective devices -
Photometric and physical requirements -
Part 2 : Retro-reflective devices
O Introduction IEC iblication No. 50(45), International Electrotechnical
Vocabulary - Lighting.
In producing this part of IS0 6742, the aim has been to specify
so that CIE Publication No. 15, Colorimetry : Officialrecommendations
requirements for retro-reflective devices fitted to cycles

in conditions of poor visibility and at night, such devices are of the International Commission on Illumination (CIE).

effective in helping to make all road users aware of the pre-
sence of a cyclist.
3 Definitions
IS0 6742/1 specifies requirements for lighting equipment.
For the purposes of this part of IS0 6742, the definitions given
below, together with those in IEC Publication No. 50(45) apply.
1 Scope and field of application
3.1 retro-reflective device; reflector : An assembly ready
This part of IS0 6742 specifies photometric and physical requi-
for use and comprising one or more retro-reflecting optical
rements for retro-reflective devices for fitting to cycles intended
to be used on public roads and, in particular, for use on cycles
made in compliance with IS0 4210.
3.2 wide angle reflector : Device providing retro-reflection
through horizontal entrance angles of not less than 50O on
2 References
either side of the reference axis.
IS0 3768, Metallic coatings - Neutral salt spray test (NSS
3.3 conventional reflector : Device providing retro-
reflection through horizontal entrance angles of not less than

IS0 4210, Cycles - Safety requirements of bicycles. 20° on either side of the reference axis.

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IS0 6742/2-1984
4 Symbols and units used (see figure 1)
(OP c\
Figure 1 - Explanatory diagram of symbols used
D : mean diameter of retro-reflective annulus on retro-reflective
NOTE - The following symbols are in accordance wiih regulation
tyres, in millimetres.
No. 3 of the UN/ECE concerning retro-reflecting devices.1)
A : area of the effective reflex surface of the retro-reflecting
a : observation angle.
device, in square centimetres.
p : entrance angle. With respect to the line C,C which is always
C : reference centre.
considered to be horizontal, this angle is prefixed with signs
- (left), +(right), +(up) or -(down), according to the posi-
NC : reference axis.
tion of the source Se in relation to the axis NC, as seen when
looking towards the retro-reflecting device. For any direction
R, : receiver, observer or measuring device.
defined by two angles, vertical and horizontal, the vertical
angle is always given first.
C, : centre of receiver.
y : angular subtense of the measuring device R, as seen from
#, : diameter of receiver R,, if circular, in centimetres.
point C.
Se : source of illumination.
6 : angular subtense of the source Se as seen from point C.
C, : centre of source of illumination.
E : rotation angle. This angle is positive when the rotation is
#, : diameter of source of illumination, in centimetres.
clockwise as seen when looking towards the illuminated sur-
face. If the reflecting device is marked 'TOP', the position thus
De : distance from centre C, to centre C, in metres.
indicated is taken as the origin.
Dé : distance from centre C, to centre C, in metres.
NOTE - All angles are expressed in degrees and minutes.
NOTE - De and DL are generally very nearly the saine and under
normal conditions of observation it may be assumed that
E : illuminance of the retro-reflecting device, in lux.
De = Dé. Furthermore, the effective distances may be used when
a collimated system is used in order to obtain an artificially increas-
CIL : coefficient of luminous intensity, in millicandelas per lux.
ed measuring distance.

Document E/ECE 324 - E/ECE/TRANS/505 - Addendum Z/Revision 1, Regulation No. 3 ; Uniform provisions concerning the approval of

reflex reflecting devices for power-driven vehicles and their trailers.
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IS0 6742/2-1984 (E)
5/8 x clear values. Values for red reflectors shall be
5 Photometric requirements be
1/4 x clear values.
Table 2 applies to pedal reflectors.
5.1 Reflectors
When tested by the method given in clause 8, the CIL values
5.2 Retro-reflective tyres
for reflectors shall not be less than those specified in table 1
or 2.
When tested by the method given in clause 9, the CIL values
for a retro-reflective tyre shall be not less than those specified in
table 3. In the case where D is less than 420 mm the minimum

Table 1 applies to front, side and rear reflectors. Values given photometric value for each observation and entrance angle

are for clear (white) reflectors. Values for yellow reflectors shall shall be equal to the value for D = 420 mm.

Table 1 - Coefficients of luminous intensity, CIL, for clear reflectors
I I Entrance anale, Bo I
Vertical : f 10 O O O O
I angle, ao
Horizontal : O O f 20 I 30 I40 f50
I O0 12' I 2 500 I 1650 I 750 1 650 I
610 540 470 400
O0 20 1800 1 200
lo 30 26 18 11 11 11 11

NOTE - Values for entrance angles of f 30, I 40 and I 50° are not applicable to conventional reflectors.

Table 2 - Coefficients of luminous intensity, CIL,
for yellow pedal reflectors
Entrance angle, Po
Vertical : O
angle, ao
I Horizontal : O f 20
O0 12'
O0 20' 325 250
10 30' 16,5 11.5
Table 3 - Coefficients of luminous intensity, CIL,
for retro-reflective tyres
Entrance angle, Bo
anale. ao -40 I 200 I 400 I 50°
O0 12' 1.21 D 1.06 D 0,70 D 0,21 D
O0 20' 0.91 D 0.80 D 0.53 D 0.16 D
l I I I
lo 30' 0,121 D 0,106 D 0,070 D 0,021 D
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IS0 6742/2-1984 (E)
defined by the CIE chromaticity coordinates specified in
6 Colorimetric requirements
table 4.
NOTE - For ease of reference these areas are shown graphically in
When determined by the method given in ClauSe 10, the ColOur
figure 2,
of the reflected light shall be located within the appropriate area
Table 4 - x-y chromaticity coordinates of the
intersection points of colour boundary lines
0,665 0,645 0,721 0,735
0,335 0,335 0,259 0,265
0,612 0,618
x 0,560 0,546
0,440 0,426 0,382 0,382
0,285 0,500 0,500 0,440 0,285
White x 0,453
0,332 0,440 0,440 0,382 0,382 0,264
x 0,380 0,509 0,618 0,440 0,380
0,408 0,490 0,382 0,382 0,337
I) For retro-refleciive tyres only.
Figure 2 - Boundaries of colour areas for reflective devices
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IS0 6742/2-1984 (E)
7 Physical requirements Reflector mount alignment test
When tested by the following method, the optical axis of the
reflector (excluding pedal reflectors or spoke-mounted reflec-
7.1 Reflectors
tors) shall not deflect more than 15O during the test, and shall
not exhibit a permanent displacement greater than 5O after the
7.1.1 Construction
With the reflector and mount assembled to a rigid fixture dupli-
The reflector and/or mount shall incorporate a distinct pre-
cating the mating component or frame member for which it is
ferred assembly method to ensure that the reflector can be
designed and intended for use (including a rigidly mounted
mounted in its designed orientation with regard to the bicycle.
bicycle), apply a force of 90 N to the reflector unit in at least
three directions selected as most likely to affect its alignment.
7.1.2 Tests Resistance to corrosion
After being tested by the method specified in IS0 3768 the General
reflector shall not exhibit any visible signs of corrosion liable to
affect the integrity of the mounting or housing.
A reflector shall comply with the photometric and colorimetric
requirements of 5.1 and 6, and there shall be no loosening of
50 h comprising two periods of

the rnounting(4 or distortion of the housing that would affect The duration of the test shall be

the performance of the reflector, after being subjected to any exposure of 24 h each, separated by an interval of 2 h during

which the sample is allowed to dry.
or all of the tests specified in to Resistance to fuels Temperature resistance test
Soak the outer surface of the reflector in a mixture of 70 % of
When tested by the following method, a reflector shall exhibit
n-heptane and 30 % toluene (by volume). After 5 min clean the
no noticeable defects :
surface by washing in a detergent solution and rinse in clean
Place the reflector in a &e-heated oven for a minimum period of
1 h at a temperature of 50 +O OC. Resistance to lubricating oils
NOTE - A pedal reflector may be tested integrally with its pedal.
Wipe the outer surface of the reflex reflector lightly with cotton
soaked in a detergent lubricating oil. After 5 min clean the sur-
face by washing in a detergent solution and rinse in clean Impact test water.
When a reflector is tested at room temperature by the following
method the lens shall not crack :
7.2 Retro-reflective tyres
Mount the reflector in a manner similar to the way in which it is
mounted on the bicycle, but with the lens face horizontal and
7.2.1 Form and location
directed upwards.
The retro-reflective strip shall be in the form of a continuous
Drop a 13 mm diameter polished solid steel b

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