Regulation No 31 of the United Nations Economic Commission for Europe (UN/ECE) concerning the uniform provisions concerning the approval of halogen sealed-beam unit (HSB unit) motor vehicle headlamps emitting an asymmetrical passing beam or a driving beam or both
Date: 2001-06-25
Institutions: United Nations Economic Commission for Europe
Subjects: Ecosoc, European standard, approval, motor car, signalling device, vehicle parts

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Regulation No 31 of the United Nations Economic Commission for Europe (UN/ECE) concerning
the uniform provisions concerning the approval of halogen sealed-beam unit (HSB unit) motor
vehicle headlamps emitting an asymmetrical passing beam or a driving beam or both (1)

1.

SCOPE (2)

This Regulation applies to motor vehicle headlamps which may incorporate lenses of glass
or plastic material.

2.

DEFINITIONS

For the purpose of this Regulation,

2.1.

‘Halogen sealed-beam headlamp unit’

(hereinafter termed ‘HSB unit’) means a headlamp whose components, including a reflector
of glass, metal or other material, an optical system and one or more halogen light sources,
form an integral whole which is indivisibly joined and cannot be dismantled without
rendering the unit completely unusable. Such units are:

2.1.1.

of ‘category 1’,

when they emit only a driving beam;

2.1.2.

of ‘category 21’,

when they emit only a passing beam;

2.1.3.

of ‘category 22’,

when they emit, at the user’s choice, either a driving beam or a passing beam;

2.2.

‘lens,’

means the outermost component of the headlamp (unit) which transmits light through the
illuminating surface;

2.3.

‘coating,’

means any product or products applied in one or more layers to the outer face of a lens;

2.4.

‘HSB units of different types’,

means ‘units which differ’ in such essential respects as:

2.4.1.

the trade name or mark;

(1) Regulation of the United Nations Economic Commission for Europe published pursuant to the provisions of

Article 4 (5) of Council Decision 97/836/EC (OJ L 346, 17.12.1997, p. 78).

(2) Nothing in this Regulation shall prevent a Party to the Agreement applying this Regulation from prohibiting the
combination of an HSB unit incorporating a lens of plastic material approved under this Regulation with a
mechanical headlamp-cleaning device (with wipers).

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2.4.2.

the characteristics of the optical system;

2.4.3.

the inclusion or elimination of components capable of altering the optical effects by
reflection, refraction, absorption and/or deformation during operation;
the fitting or
elimination of filters intended solely to change the colour of the beam but not its light
distribution does not constitute a change of type;

2.4.4.

the rated voltage;

2.4.5.

the shape of the filament or filaments;

2.4.6.

the kind of beam produced (passing beam, driving beam or both);

2.4.7.

the materials constituting the lens and coating, if any.

3.

3.1.

3.1.1.

3.1.2.

APPLICATION FOR APPROVAL

The application for approval shall be submitted by the owner of the trade name or mark or
by his duly accredited representative. It shall specify:

whether the HSB unit is intended to provide both a passing beam and a driving beam or
only one of these beams;

where the HSB unit is intended to provide a passing beam, whether it is designed for both
right-hand and left-hand traffic or for right-hand or left-hand traffic only.

3.2.

Every application for approval shall be accompanied by:

3.2.1.

drawings in triplicate, sufficiently detailed to permit identification of the type and giving a
front view of the HSB unit (with, if applicable, details of the lens moulding) and a cross-
section; also the filament(s) and shield(s) shall be shown on the drawings at a scale of 2:1
both in front view and in side view; the drawing must show the position intended for the
approval number and the additional symbols in relation to the circle of the approval mark;

3.2.2.

a brief technical description;

3.2.3.

samples as follows:

3.2.3.1.

for approval of an HSB unit emitting uncoloured light: five samples;

3.2.3.2.

3.2.3.3.

for approval of an HSB unit emitting coloured light: two coloured-light samples and five
uncoloured-light samples of the same type, differing from the type submitted, only in that
the lens or filter is not coloured;

in the case of HSB units which emit coloured light, which differ from uncoloured-light units
only in the colour of light emitted and which have already satisfied the requirements of
paragraphs 6, 7 and 8 below, it will be sufficient to submit only one sample of a coloured-
light unit to undergo the tests described in paragraph 9 below;

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3.2.4.

for the test of plastic material of which the lenses are made:

3.2.4.1.

thirteen lenses.

3.2.4.1.1.

six of these lenses may be replaced by six samples of material at least 60 x 80 mm in size,
having a flat or convex outer surface and a substantially flat area (radius of curvature not
less than 300 mm) in the middle measuring at least 15 x 15 mm;

3.2.4.1.2.

every such lens or sample of material shall be produced by the method to be used in mass
production;

3.2.4.2.

a reflector to which the lenses can be fitted in accordance with the manufacturer’s
instructions.

3.3.

3.4.

4.

4.1.

4.2.

4.3.

The characteristics of the materials making up the lenses and coatings, if any, should be
accompanied by the test report on these materials and coatings if they have already been
tested.

The competent authority shall verify the existence of satisfactory arrangements for ensuring
effective control of the conformity of production before type approval is granted.

MARKINGS (1)

HSB units submitted for approval shall bear the trade name or mark of the applicant.

They shall comprise, on the lens, a space of sufficient size to accommodate the approval
mark and the additional symbols provided for in paragraph 5 below; the space shall be
shown in the drawings referred to in paragraph 3.2.1 above.

They shall bear, either on the lens or on the body, the rated voltage and rated wattage of the
driving-beam filament, followed by the rated wattage of the passing-beam filament, where
applicable.

5.

APPROVAL

5.1.

General

5.1.1.

5.1.2.

If all the HSB unit type samples submitted in pursuance of paragraph 3 above meet the
requirements of this Regulation, approval shall be granted.

Where grouped, combined or reciprocally incorporated lamps satisfy the requirements of
more than one Regulation, a single international approval mark may be affixed provided
that each of the grouped, combined or reciprocally incorporated lamps satisfies the
provisions applicable to it.

(1) In the case of units designed to meet the requirements of traffic moving on one side of the road only (either right
or left), it is further recommended that the area which can be occulted to prevent discomfort to users in a country
where traffic moves on the side of the road opposite to that for which the unit was designed should be outlined
indelibly on the lens. This marking is not necessary, however, where the area is clearly apparent from the design.

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5.1.3.

5.1.4.

5.1.5.

An approval number shall be assigned to each type approved. Its first two digits (at
present 02) shall indicate the series of amendments incorporating the most recent major
technical amendments made to the Regulation at the time of issue of the approval. The same
Contracting Party may not assign the same number to another type of HSB unit covered by
this Regulation except in the case of an extension of the approval to a device differing only
in the colour of the light emitted.

Notice of approval or of extension or refusal or withdrawal of approval or production
definitely discontinued of a type of optical unit pursuant to this Regulation shall be
communicated to the Parties to the 1958 Agreement applying this Regulation, by means of
a form conforming to the model in annex 1 to this Regulation.

In addition to the mark prescribed in paragraph 4.1, an approval mark as described in
paragraphs 5.2 and 5.3 below shall be affixed in the spaces referred to in paragraph 4.2
above to every headlamp conforming to a type of HSB unit approved under this Regulation.

5.2.

Composition of the approval mark

The approval mark shall consist of:

5.2.1.

an international approval marking, comprising:

5.2.1.1.

a circle surrounding the letter ‘E’ followed by the distinguishing number of the country
which has granted approval (1);

5.2.1.2.

the approval number prescribed in paragraph 5.1.3 above;

5.2.2.

the following additional symbol (or symbols):

5.2.2.1.

on HSB optical units meeting left-hand traffic requirements only, a horizontal arrow,
pointing to the right of an observer, facing the HSB optical unit, i.e., to the side of the road
on which the traffic moves;

5.2.2.2.

on HSB optical units meeting the requirements of this Regulation in respect of the passing
beam only, the letters ‘HSC’;

5.2.2.3.

on HSB optical units meeting the requirements of this Regulation in respect of the driving
beam only, the letters ‘HSR’;

5.2.2.4.

on HSB optical units meeting the requirements of this Regulation in respect of both the
passing beam and the driving beam, the letters ‘HSCR’;

5.2.2.5.

on HSB optical units meeting the requirements of this Regulation in respect of the driving
beam, an indication of the maximum luminous intensity expressed by a reference mark, as
defined in paragraph 8.3.2.1.2 below, placed near the circle surrounding the letter ‘E’:

(1) 1 for Germany, 2 for France, 3 for Italy, 4 for the Netherlands, 5 for Sweden, 6 for Belgium, 7 for Hungary, 8 for
the Czech Republic, 9 for Spain, 10 for Yugoslavia, 11 for the United Kingdom, 12 for Austria, 13 for
Luxembourg, 14 for Switzerland, 15 (vacant), 16 for Norway, 17 for Finland, 18 for Denmark, 19 for Romania,
20 for Poland, 21 for Portugal and 22 for the Russian Federation, 23 for Greece, 24 (vacant), 25 for Croatia, 26
for Slovenia, 27 for Slovakia, 28 for Belarus, 29 for Estonia, 30 (vacant), 31 for Bosnia and Herzegovina, 32-36
(vacant), 37 for Turkey, 38-39 (vacant), and 40 for the former Yugoslav Republic of Macedonia. Subsequent
numbers will be assigned to other countries in the chronological order in which they ratify or accede to the
Agreement concerning the Adoption of Uniform Technical Conditions for Wheeled, Equipments and parts which
can be fitted and/or be used on wheeled vehicle and the conditions for Reciprocal Recognition of Approvals
Granted on the basis of these prescriptions, and the numbers thus assigned shall be communicated by the
Secretary-General of the United Nations to the Contracting Parties to the Agreement.

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5.2.2.6.

on HSB units incorporating a lens of plastic material, the group of letters ‘PL’ near the
symbols prescribed in paragraphs 5.2.2.3 to 5.2.2.5 above.

5.2.2.7.

5.2.2.8.

the two digits of the approval number (at present 02) which indicate the series of
amendments Incorporating the most recent major technical amendments made to the
Regulation at the time of issue of the approval and, if necessary, the required arrow may be
marked close to the above additional symbols.

In every case the relevant operating mode used during the test procedure according to
paragraph 1.1.1.1 of annex 6 and the allowed voltage(s) according to paragraph 1.1.1.2 of
annex 6 shall be stipulated on the approval forms and on the communication forms
transmitted to the countries which are Contracting Parties to the Agreement and which
apply this Regulation. In the corresponding cases the device shall be marked as follows: on
units meeting the requirements of this Regulation which are so designed that the filament of
the passing beam shall not be lit simultaneously with that of any other lighti ng function
with which it may be reciprocally incorporated: an oblique stroke (/) shall be placed behind
the passing lamp symbol in the approval mark.

5.2.2.9.

The marks and symbols referred to in paragraphs 5.2.1 and 5.2.2 above shall be clearly
legible and be indelible even when the optical unit is fitted in the vehicle.

5.3.

Arrangement of the approval mark

5.3.1.

I n d e p e n d e n t l a m p s

Annex 2, figures 1 to 7, to this Regulation gives examples of arrangements of the approval
mark with the above-mentioned additional symbols.

5.3.2.

G r o u p e d , c o m b i n e d o r r e c i p r o c a l l y i n c o r p o r a t e d l a m p s

5.3.2.1.

Where grouped, combined or reciprocally incorporated lamps have been found to comply
with the requirements of several Regulations, a single international approval mark may be
affixed, consisting of a circle surrounding the letter ‘E’ followed by the distinguishing number
of the country which has granted the approval, and an approval number. This approval
mark may be located anywhere on the grouped, combined or reciprocally incorporated
lamps, provided that:

5.3.2.1.1.

it is visible after their installation;

5.3.2.1.2.

no part of the grouped, combined or reciprocally incorporated lamps that transmits light
can be removed without at the same time removing the approval mark.

5.3.2.2.

The identification symbol for each lamp appropriate to each Regulation under which
approval has been granted,
together with the corresponding series of amendments
incorporating the most recent major technical amendments to the Regulation at the time of
issue of the approval and, if necessary, the required arrow shall be marked:

5.3.2.2.1.

either on the appropriate light-emitting surface,

5.3.2.2.2.

or in a group, in such a way that each of the grouped, combined or reciprocally incorporated
lamps may be clearly identified (see four possible examples in annex 2).

5.3.2.3.

The size of the components of a single approval mark shall not be less than the minimum
size required for the smallest of the individual marks by the Regulation under which
approval has been granted.

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5.3.2.4.

5.3.2.5.

An approval number shall be assigned to each type approved. The same Contracting Party
may not assign the same number to another type of grouped, combined or reciprocally
incorporated lamps covered by this Regulation.

Annex 2, figure 8, to this Regulation gives examples of arrangements of approval marks for
grouped, combined or reciprocally incorporated lamps with all the above-mentioned
additional symbols.

5.3.3.

Lamps, the lens of which is used for different types of lamps and which may be reciprocally
incorporated or grouped with other lamps.

The provisions laid down in paragraph 5.3.2 above are applicable.

5.3.3.1.

In addition, where the same lens is used, the latter may bear the different approval marks
relating to the different types of headlamps or units of lamps, provided that the main body
of the HSB unit, even if it cannot be separated from the lens, also comprises the space
described in paragraph 4.2 above and bears the approval mark of the actual functions.

If different types of HSB units comprise the same main body, the latter may bear the different
approval marks.

5.3.3.2.

Annex 2, figure 9, to this Regulation gives examples of arrangements of approval marks
relating to the above case.

6.

6.1.

6.2.

6.2.1.

6.2.2.

6.3.

6.4.

GENERAL SPECIFICATIONS

Every sample shall conform to the specifications set forth in this paragraph and in
paragraphs 7 and 8 below and, if necessary, to those set forth in paragraph 9.

HSB units shall be so designed and made that in normal use, despite the vibrations to which
they may then be subjected, their satisfactory operation continues to be ensured and they
retain the characteristics prescribed by this Regulation.

HSB optical units shall be fitted with a device enabling them to be so adjusted on the vehicle
as to comply with the rules applicable to them. Such a device need not be fitted on HSB
optical unit insert if the use of such inserts is confined to vehicles on which the headlamp
setting can be adjusted by other means.

Where an HSB optical unit providing a driving beam and an HSB optical unit providing a
passing beam are assembled as exchangeable subunits to form a composite unit, the
adjusting device shall enable each HSB unit individually to be duly adjusted.

However, this will not apply to headlamp assemblies whose reflectors are indivisible. For
this type of assembly the requirements of paragraph 8.3 of this Regulation shall apply. In
the case where more than one light source is used to provide the main beam, the combined
main-beam functions will be used to determine the maximum value of the illumination
(EM).

The terminals shall be in electrical contact with the appropriate filament or filaments only
and shall be robust and firmly fixed to the HSB unit.

HSB units shall comprise electrical connections in conformity with those shown in one of
the patterns reproduced in annex 3 to this Regulation and shall be of the dimensions
specified in that annex.

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6.5.

6.6.

Complementary tests shall be done according to the requirements of annex 6 to ensure that
in use there is no excessive change in photometric performance.

If the lens of the HSB unit is of plastic material, tests shall be done according to the
requirements of annex 7.

7.

RATED AND TEST VALUES

7.1.

The rated voltage is 12 volts (1).

7.2.

The wattage shall not exceed 75 watts on the driving beam filament and 68 watts on the
passing beam filament measured at a test voltage of 13.2 volts.

8.

ILLUMINATION (2)

8.1.

General specifications

8.1.1.

HSB units shall be made so as to give adequate illumination without dazzle when emitting
the passing beam and good illumination when emitting the driving beam.

8.1.2.

The illumination produced by the HSB unit shall be determined by means of a vertical screen
set up 25 m forward of the unit as shown in annex 4 to this Regulation (3).

8.1.3.

On this screen, the illumination referred to in paragraphs 8.2.5, 8.2.6 and 8.3 below shall
be measured by means of a photoreceptor, the effective area of which shall be contained
within a square of 65 mm side.

8.2.

Requirements concerning the passing beam

8.2.1.

The passing beam shall produce a ‘cut-off’ sharp enough to serve as a satisfactory means of
adjustment. The ‘cut-off’ shall be a horizontal straight line on the side opposite to the
direction of the traffic for which the unit is intended. On the other side it shall not extend
beyond either the broken line HV H1 H4 formed by a straight line HV H1 making a 45°
angle with the horizontal and a straight line H1 H4, 25 cm above the straight line hh, or the
straight line HV H3, inclined at an angle of 15° above the horizontal (see annex 4 to this
Regulation). A ‘cut-off’ extending beyond both line HV H2 and line H2 H4 and resulting
from a combination of the above two possibilities shall in no circumstances be permitted.

(1) Requirements for HSB units with a rated voltage of 24 volts are under consideration.
(2) All photometric measurements shall be made at the rated voltage specified in paragraph 7.1.
(3) If, in the case of an HSB unit designed to meet the requirements of this Regulation in respect of the passing beam
only, the focal axis diverges appreciably from the general direction of the beam, lateral adjustment shall be
effected in the manner which best satisfies the requirements for illumination at points 75 R and 50 R for right-
hand traffic and 75 L and 50 L for left-hand traffic.

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8.2.2.

The HSB unit shall be so aimed that on the passing beam:

8.2.2.1.

in the case of HSB units designed to meet the requirements of right-hand traffic, the ‘cut-off’
on the left half of the screen (1) is horizontal and, in the case of HSB units designed to meet
the requirements of left-hand traffic, the ‘cut-off’ on the right half of the screen is horizontal;

8.2.2.2.

this horizontal part of the ‘cut-off’ is situated on the screen 25 cm below the level hh (see
annex 4 to this Regulation);

8.2.2.3.

the ‘elbow’ of the ‘cut-off’ is on line vv (2).

8.2.3.

8.2.4.

the HSB unit need meet only the requirements laid down in
When so adjusted,
paragraphs 8.2.5 and 8.2.6 below if approval thereof is sought solely for provision of a
passing beam (3); if it is intended to provide both a passing beam and a driving beam it shall
meet the requirements laid down in paragraphs 8.2.5, 8.2.6 and 8.3.

Where an HSB unit so adjusted does not meet the requirements laid down in para-
graphs 8.2.5, 8.2.6 and 8.3, its alignment may be changed provided that the axis of the
beam is not displaced laterally by more than 1° (= 44 cm) to the right or left (4). To facilitate
alignment by means of the ‘cut-off’, the unit may be partially occulted in order to sharpen
the ‘cut-off’.

8.2.5.

The illumination produced on the screen by the passing beam shall meet the following
requirements:

Point on measuring screen

Required illumination

HSB Headlamps
for right-hand traffic

HSB Headlamps
for left-hand traffic

B 50 L

B 75 R

B 75 L

B 50 L

B 50 R

B 50 V

B 25 L

B 25 R

B 50 L

B 75 L

B 75 R

B 50 R

B 50 L

B 50 V

B 25 R

B 25 L

Any point in zone III

Any point in zone IV

Any point in zone I

(*) E 50 R and E 50 L are the illuminations actually measured.

˜ 0,4

¯ 12

˜ 12

˜ 15

¯ 12

¯ 6

¯ 2

¯ 2

˜ 0,7

¯ 3

˜ 2 x (E 50 R or) (*) /(E 50 L)

(1) The test screen shall be wide enough to allow examination of the ‘cut-off’ over a range of at least 5° on either side

of the line vv.

(2) If the beam does not have a ‘cut-off’ with a clear ‘elbow’, lateral adjustment shall be affected in the manner which
best satisfies the requirements for illumination at points 75 R and 50 R for right-hand traffic and 75 L and 50 L
for left-hand traffic.

(3) An HSB unit designed to emit a passing beam may incorporate a driving beam not subject to this specification.
(4) The limit of realignment of 1° to the right or left is not incompatible with vertical realignment upward or
downward. The latter is limited only by the requirements of paragraph 8.3. However, the horizontal part of the
‘cut-off’ should not extend beyond the line hh (the provisions of paragraph 8.3 are not applicable to HSB units
intended to meet the requirements of this Regulation only for provision of a passing beam).

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8.2.6.

8.3.

8.3.1.

There shall be no lateral variations detrimental to good visibility in any of the Zones I, II, III
and IV.

Requirements concerning the driving beam

In the case of an HSB unit designed to provide a driving beam and a passing beam,
measurements of the illumination produced on the screen by the driving beam shall be
taken with the same HSB unit alignment as for measurements under paragraphs 8.2.5 and
8.2.6; if the HSB unit provides a driving beam only, it shall be so adjusted that the area of
maximum illumination is centred on the point of intersection HV of lines hh and vv; such
an HSB unit need meet only the requirements laid down in paragraph 8.3.

8.3.2.

The illumination produced on the screen by the driving beam shall meet the following
requirements:

8.3.2.1.

The point of intersection HV of lines hh and vv shall be situated within the isolux 80 % of
maximum illumination. This maximum value (EM) shall not be less than 48 lux. The
maximum value (EM) shall not exceed 240 lux; in addition, in the case of a combined passing
and driving HSB unit, it shall in no case exceed 16 times the illumination measured for the
passing beam at point 75 R (or 75 L).

8.3.2.1.1.

The maximum intensity (IM) of the driving beam expressed in thousands of candelas shall be
calculated by the formula:

IM = 0,625 EM

8.3.2.1.2.

The reference mark (I’M) of this maximum intensity, referred to in paragraph 5.2.2.5, shall
be obtained by the ratio:

I’M = IM / 3 = 0,208 EM

This value shall be rounded off to the nearest value 7,5 — 10 — 12,5 — 17,5 — 20 — 25
— 27,5 — 30 — 37,5 — 40 — 45 — 50.

8.3.2.2.

Starting from point HV, horizontally to the right and left, the illumination shall be not less
than 24 lux up to a distance of 1,125 m and not less than 6 lux up to a distance of 2,25 m.

9.

9.1.

COLOUR

Approval may be obtained for HSB units emitting either white or selective yellow light (1).
Expressed in CIE trichromatic co-ordinates, the corresponding colorimetric characteristics
for selective yellow light are as follows at the test voltage:

Limit towards red y ¯ 0,138 + 0,580 x

Limit towards green y ˜ 1,290x — 0,100

Limit towards white y ¯ − x + 0,966

Limit towards spectral value y ˜ − x + 0,992

(1) Notwithstanding the provisions of article 3 of the 1958 Agreement concerning the Adoption of Uniform
Conditions of Approval and Reciprocal Recognition of approval for Motor Vehicle Equipment and Parts, the
approval of an HSB unit under this Regulation shall not prevent the Contracting Parties to the Agreement
applying this Regulation from prohibiting, on vehicles registered in their territory, the use of HSB units emitting
a beam of either white or selective yellow light.

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which can be expressed as follows:

dominant wave length: 575 to 585 nm

purity factor: 0,90 to 0,98

9.2.

The illumination produced on the screen by a selective yellow passing beam shall meet the
requirements of paragraphs 8.2.5 and 8.2.6 with the minimum illuminations multiplied by
a factor of 0,85; the maximum illumination values remain the same.

10.

GAUGING OF DISCOMFORT

The discomfort caused by the passing beam of HSB units shall be gauged (1).

11.

CONFORMITY OF PRODUCTION

11.1.

11.2.

Headlamps approved under this Regulation shall be so manufactured as to conform to the
type approved by meeting the requirements set forth in paragraphs 8 and 9.

In order to verify that the requirements of paragraph 11.1 are met, suitable controls of the
production shall be carried out.

11.3.

The holder of the approval shall in particular:

11.3.1.

ensure the existence of procedures for the effective control of the quality of products;

11.3.2.

have access to the control equipment necessary for checking the conformity to each
approved type;

11.3.3.

ensure that data of test results are recorded and that related documents shall remain available
for a period to be determined in accordance with the administrative service;

11.3.4.

analyze the results of each type of test in order to verify and ensure the stability of the
product characteristics, making allowance for variation of an industrial production;

11.3.5.

ensure that for each type of product at least the tests prescribed in annex 5 to this Regulation
are carried out;

11.3.6.

ensure that any collecting of samples giving evidence of non-conformity with the type of
test considered shall give rise to another sampling and another test. All the necessary steps
shall be taken to re-establish the conformity of the corresponding production.

11.4.

The competent authority which has granted hype approval may at anytime verify the
conformity control methods applicable to each production unit.

11.4.1.

In every inspection, the test books and production survey records shall be presented to the
visiting inspector.

(1) This requirement will be subject to a recommendation to administrations.

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11.4.2.

11.4.3.

11.4.4.

11.4.5.

The inspector may take samples at random to be tested in the manufacturer’s laboratory.
The minimum number of samples may be determined in the light of the results of the
manufacturer’s own checks.

When the quality level appears unsatisfactory or when it seems necessary to verify the
validity of the tests carried out in the application of paragraph 11.4.2 above, the inspector
shall select samples, to be sent to the technical service which has conducted the type
approval tests, using the criteria of annex 8.

The competent authority may carry out any test prescribed in this Regulation. These tests
will be on samples selected at random without causing distortion of the manufacturer’s
delivery commitments and in accordance with the criteria of annex 8.

The competent authority shall strive to obtain a frequency of inspection of once every two
years, However, this is at the discretion of the competent authority and their confidence in
the arrangements for ensuring effective control of the conformity of production. In the case
where negative results are recorded, the competent authority shall ensure that all necessary
steps are taken to re-establish the conformity of production as rapidly as possible.

11.5.

Headlamps with apparent defects are disregarded.

11.6.

The reference mark is disregarded.

12.

12.1.

12.2.

13.

13.1.

PENALTIES FOR NON-CONFORMITY OF PRODUCTION

The approval granted in respect of a type of HSB unit pursuant to this Regulation may be
withdrawn if the requirements set forth above are not met, or if an HSB unit bearing the
approval mark does not conform to the type approved.

If a Contracting Party to the Agreement applying this Regulation withdraws an approval it
has previously granted, it shall forthwith so notify the other Contracting Parties applying
this Regulation, by means of a communication form conforming to the model in annex 1 to
this Regulation.

MODIFICATION AND EXTENSION OF APPROVAL OF A TYPE OF HALOGEN ‘SEALED-BEAM’
HEADLAMP UNIT (HSB UNIT)

Every modification of the type of HSB unit shall be notified to the administrative department
which approved the type of HSB unit. The department may then either:

13.1.1.

consider that the modifications made are unlikely to have an appreciable adverse effect and
that in any case the HSB unit still complies with the requirements; or

13.1.1.

require a further test report from the technical service responsible for conducting the tests.

13.2.

Confirmation or refusal of approval, specifying the alterations shall be communicated by the
procedure specified in paragraph 5.1.4 above to the Parties to the Agreement applying this
Regulation.

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13.3.

The competent authority issuing the extension of approval shall assign a series number for
such an extension and inform thereof the other Parties to the 1958 Agreement applying this
Regulation by means of a communication form conforming to the model in annex 1 to this
Regulation.

14.

PRODUCTION DEFINITELY DISCONTINUED

If the holder of an approval completely ceases to manufacture a type of HSB unit approved
in accordance with this Regulation, he shall so inform the authority which granted the
approval. Upon receiving the relevant communication, that authority shall inform thereof
the other Parties to the 1958 Agreement applying this Regulation by means of a
communication form conforming to the model in annex 1 to this Regulation.

15.

15.1.

15.2.

15.3.

15.3.1.

15.3.2.

16.

TRANSITIONAL PROVISIONS

As from the date of entry into force of the 02 series of amendments to this Regulation no
Contracting Party applying it shall refuse to grant approvals under this Regulation as
amended by the 02 series of amendments.

As from 24 months after the date of entry into force mentioned in paragraph 15.1 above,
Contracting Parties applying this Regulation shall grant approvals only if the type of HSB
unit corresponds to the requirements of this Regulation as amended by the 02 series of
amendments.

Existing approvals granted under this Regulation before the date mentioned in para-
graph 15.2 above shall remain valid. However, Contracting Parties applying this Regulation
may prohibit the fitting of HSB units which do not meet the requirements of this Regulation
as amended by the 02 series of amendments:

on vehicles for which type approval or individual approval is granted more than 24 months
after the date of entry into force mentioned in paragraph 15.1 above,

on vehicles first registered more than five years after the date of entry into force mentioned
in paragraph 15.1 above.

NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR CONDUCTING
APPROVAL TESTS AND OF ADMINISTRATIVE DEPARTMENTS

The Parties to the 1958 Agreement applying this Regulation shall communicate to the
United Nations Secretariat the names and addresses of the technical services responsible for
conducting approval tests and of the administrative departments which grant approval and
to which forms certifying approval or extension or refusal or withdrawal of approval, or
production definitely discontinued, issued in other countries, are to be sent.

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ANNEX 1

Communication concerning the approval or extension or communication

[maximum format: A4 (210 x 297 mm)]

issued by: Name of administration

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

concerning (2): APPROVAL GRANTED

APPROVAL EXTENDED

APPROVAL REFUSED

APPROVAL WITHDRAWN

PRODUCTION DEFINITIVELY DISCONTINUED

of a type of: Halogen ‘Sealed-Beam’ Headlamp Unit (HSB unit) pursuant to Regulation No 31

Approval No.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extension No. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.

HSB unit submitted for approval as type (3)

Colour of light emitted: white/selective yellow (2)

Rated voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rated wattage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.

The passing lamp filament may/may not (2) be lit simultaneously with the driving lamp filament and/or another
reciprocally incorporated lamp.

(1) Distinguishing number of the country which has granted/extended/refused/withdrawn approval (see approval

provisions in the Regulation).
(2) Strike out what does not apply.
(3) Indicate the appropriate marking selected from the list below:

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3.

Trade name or mark:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Manufacturer’s name and address:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.

6.

7.

8.

9.

If applicable, name and address of manufacturer’s representative: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Submitted for approval on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical service responsible for conducting approval tests:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Date of report issued by that service: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Number of report issued by that service:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10. Approval granted/extended/refused/withdrawn (1)

11. Reason(s) of extension (if applicable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12. Maximum illumination (in lux) of the driving beam at 25 m from the HSB unit . . . . . . . . . (average for 5 units)

13. Place:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14. Date: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15. Signature:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16. The attached drawing No.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . shows the unit.

(1) Strike out what does not apply.

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ANNEX 2

Examples of arrangements of approval marks

Figure 1

a = 12 mm min.

The above approval mark affixed to an HSB optical unit indicates that the unit concerned was approved in the
Netherlands (E4) under number 2439, that it meets the requirements of this Regulation, as amended by the 02 series
of amendments, in respect of both the driving beam and the passing beam, and that it is designed for right-hand
traffic only.

The figure 30 indicates that the maximum intensity of the driving beam is between 86 250 and 101 250 candelas.

Note: The approval number and the additional symbol(s) shall be placed close to the circle and either above or below
the letter ‘E’, or to the right or left of that letter. The digits of the approval number shall be on the same side of
the letter ‘E’ and face the same direction. The use of Roman numerals as approval numbers should be avoided
so as to prevent any confusion with other symbols.

Figure 2

a = 12 mm min.

The above approval mark affixed to an HSB optical unit indicates that the unit concerned meets the requirements of
this Regulation as amended by the 02 series of amendments, with respect to both the passing beam and the driving
beam and that it is designed for left-hand traffic only.

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Figure 3 a

The above approval mark affixed to an HSB optical unit indicates that the unit concerned meets the requirements of
this Regulation as amended by the 02 series of amendments, in respect of the passing beam only, and that it is
designed for right-hand traffic only.

Figure 3 b

Figure 4

Figure 5

The above approval marks affixed to HSB optical units incorporating the lens of plastic material indicate that the
units concerned meet the requirements of this Regulation, as amended by the 02 series of amendments: With respect
to the passing With respect to the beam only, and that they are driving beam only designed for left-hand traffic only.
The number 30 indicates that the maximum intensity of the driving beam is between 82 500 and 101 250 candelas.

Figure 6

Figure 7

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Identification of an HSB unit meeting the requirements of Regulation No 31 with respect to both the passing with
respect to the passing beam and the driving beam and beam only and designed for designed for right-hand traffic
only.

The passing lamp filament shall not be lit simultaneously with the driving lamp filament and/or another reciprocally
incorporated lamp.

Figure 8

Simplified marking for grouped, combined or reciprocally incorporated lamps (The vertical and horizontal lines
schematise the shape of the light-signalling device. They are not part of the approval mark.)

Model A

Model B

Model C

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Model D

Note: The four examples shown above correspond to a lighting device bearing an approval mark relating to:

a front position lamp approved in accordance with the 01 series of amendments to Regulation No 7;

an HSB optical unit with a passing beam designed for right-hand and left-hand traffic and a driving beam with a
maximum intensity comprised between 86 250 and 101 250 candelas (as indicated by the number 30), approved in
accordance with the 02 series of amendments to Regulation No 31 and incorporating a lens of plastic material;

a front fog lamp approved in accordance with the 02 series of amendments to Regulation No 19 and incorporating
a lens of plastic material;

a front direction indicator lamp of category la, approved in accordance with the 02 series of amendments to
Regulation No 6.

Figure 9

Lamp reciprocally incorporated with an HSB unit

Example 1

The above example corresponds to the marking of a lens of plastic material intended to be used in different types of
HSB units, namely:

either: an HSB unit with a passing beam designed for right-hand and left-hand traffic and a driving beam approved
in Germany (E1) in accordance with the requirements of Regulation No 5 as amended by the 02 series of
amendments, which is reciprocally incorporated with a front position lamp approved in accordance with the
01 series of amendments to Regulation No 7;

or: an HSB unit with a passing beam designed for right-hand and left-hand traffic and a driving beam with a
maximum intensity comprised between 86 250 and 101 250 candelas, approved in Germany (E1) in accordance
with the requirements of Germany (E1) in accordance with the requirements of Regulation No 31 as amended by the
02 series of amendments which is reciprocally incorporated with the same front position lamp as above;

or even: either of the above-mentioned HSB units approved as a single lamp.

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The main body of the optical unit shall bear the only valid approval number, for instance:

Exemple 2

The above example corresponds to the marking of a lens used in an assembly of two HSB optical units approved in
the Netherlands (E4), consisting of a headlamp emitting a passing beam designed for both traffic systems and of a
driving beam meeting the requirements of Regulation No 1, and of a headlamp emitting a driving beam meeting the
requirements of Regulation No 31.

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ANNEX 3

Electrical connections of HSB units

Category 1 (Driving only)

Fig. 1

Category 21 (Passing only)

Fig. 2

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Category 22 (Passing and driving)

Fig. 3

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ANNEX 4

Measuring screen

A.

HSB unit for right-hand traffic

Dimensions in mm

B.

HSB unit for left-hand traffic

Dimensions en mm

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ANNEX 5

Minimum requirements for conformity of production control procedures

1.

GENERAL

1.1.

1.2.

1.2.1.

The conformity requirements shall be considered satisfied from a mechanical and geometric standpoint,
if the differences do not exceed inevitable manufacturing deviations within the requirements of this
Regulation.

With respect to photometric performances, the conformity of mass produced headlamps shall not be
contested if, when testing photometric performances of any headlamp chosen at random:

no measured value deviates unfavourably by more than 20 per cent from the values prescribed in this
Regulation. For values B 50 (or R) and zone III, the maximum unfavourable deviation may be
respectively:

B 50 L (or R) 0,2 lx equivalent 20 per cent

0,3 lx equivalent 30 per cent

Zone III 0,3 lx equivalent 20 per cent

0,45 lx equivalent 30 per cent

1.2.2.

or if:

1.2.2.1.

for the passing beam, the values prescribed in this Regulation are met at HV (with a tolerance of + 0,2
lx) and related to that aiming at least one point of each area delimited on the measuring screen (at
25 m) by a circle 15 cm in radius around points B 50 L (or R) (1) (with a tolerance of + 0,1 lx), 75 R
(or L), 50 V, 25 R, 25 L, and in the entire area of zone IV which is not more than 22,5 cm above line
25 R and 25 L;

1.2.2.2.

and if, for the driving beam, HV being situated within the isolux 0,75 Emax, a tolerance of + 20 per
cent for maximum values and – 20 per cent for minimum values is observed for the photometric
values at any measuring point specified in paragraph 8.3 of this Regulation.

1.2.3.

If the results of the tests described above do not meet the requirements, the alignment of the headlamp
may be changed, provided that the axis of the beam is not displaced laterally by more than 1° to the
right or left (2).

1.3.

With respect to the verification of the change in vertical position of the cut-off line under the influence
of heat, the following procedure shall be applied:

One of the sampled headlamps shall be tested according to the procedure described in paragraph 2.1
of annex 6 after being subjected three consecutive times to the cycle described in paragraph 2.2.2 of
annex 6.

The headlamp shall be considered as acceptable if ˜ r does not exceed 1,5 mrad.

(1) Letters in brackets refer to headlamps intended for left-hand traffic.
(2) See the corresponding footnote (note 4, p. 53) in the text of the Regulation.

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If this value exceeds 1,5 mrad but is not more than 2,0 mrad, a second headlamp shall be subjected to
the test after which the mean of the absolute values recorded on both samples shall not exceed
1,5 mrad.

1.4.

The chromaticity coordinates shall be complied with.

The photometric performance of a headlamp emitting selective yellow light shall be the values
contained in this Regulation multiplied by 0,84.

2.

MINIMUM REQUIREMENTS FOR VERIFICATION OF CONFORMITY BY THE MANUFACTURER

For each type of headlamp the holder of the approval mark shall carry out at least the following tests,
at appropriate intervals. The tests shall be carried out in accordance with the provisions of this
Regulation.

If any sampling shows non-conformity with regard to the type of test concerned, further samples shall
be taken and tested. The manufacturer shall take steps to ensure the conformity of the production
concerned.

2.1

Nature of tests

Tests of conformity in this Regulation shall cover the photometric characteristics and the verification
of the change in vertical position of the cut-off line under the influence of heat.

2.2.

Methods used in tests

2.2.1.

Tests shall generally be carried out in accordance with the methods set out in this Regulation.

2.2.2.

In any test of conformity carried out by the manufacturer, equivalent methods may be used with the
consent of the competent authority responsible for approval tests. The manufacturer is responsible for
proving that the applied methods are equivalent to those laid down in this Regulation.

2.2.3.

The application of paragraphs 2.2.1 and 2.2.2 requires regular calibration of test apparatus and its
correlation with measurements made by a competent authority.

2 2.4.

In all cases the reference methods shall be those of this Regulation, particularly for the purpose of
administrative verification and sampling.

2.3.

Nature of sampling

Samples of headlamps shall be selected at random from the production of a uniform batch. A ‘uniform
batch’ means a set of headlamps of the same type, defined according to the production methods of the
manufacturer.

in general cover series production from individual factories. However, a
The assessment shall
manufacturer may group together records concerning the same type from several factories, provided
these operate under the same quality system and quality management.

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2.4.

Measured and recorded photometric characteristics

The sampled headlamp shall be subjected to photometric measurements at the points provided for in
the Regulation, the reading being limited to points Emax, HV (1), HL, HR (2) in the case of the driving
beam, and to points B 50 L (or R), HV, 50 V, 75 R (or L) and 25 L (or R) in the case of the passing
beam (see figure in annex 4).

2.5.

Criteria governing acceptability

The manufacturer is responsible for carrying out a statistical study of the test results and for defining,
in agreement with the competent authority, criteria governing the acceptability of his products in
order to meet the specifications laid down for verification of conformity of products in paragraph 11.1
of this Regulation.

The criteria governing the acceptability shall be such that, with a confidence level of 95 per cent, the
minimum probability of passing a spot check in accordance with annex 8 (first sampling) would be
0,95.

(1) When the driving beam is reciprocally incorporated with the passing beam, HV in the case of the driving beam shall be the same

measuring point as in the case of the passing beam.

(2) HL and HR: points on ‘hh’ located at 1,125 m to the left and to the right of point HV respectively.

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ANNEX 6

Tests for stability of photometric performance of headlamps in operation

Tests on complete headlamps

Once the photometric values have been measured according to the prescriptions of this Regulation, in points for
Emax for driving beam and HV, 50 R, B 50 L for passing beam (or HV, 50 L, B 50 R for headlamps designed for left-
hand traffic) a complete headlamp sample shall be tested for stability of photometric performance in operation.
‘Complete headlamp’ shall be understood to mean the complete lamp itself including those surrounding body parts
and lamps which could influence its thermal dissipation.

1.

TEST OF STABILITY OF PHOTOMETRIC PERFORMANCE

The tests shall be carried out in a dry and still atmosphere at an ambient temperature of 23 ° C ± 5 °
C, the complete headlamp being mounted on a base representing the correct installation on the
vehicle.

1.1.

Clean headlamp

The headlamp shall be operated for 12 hours as described in subparagraph 1.1.1 and checked as
prescribed in subparagraph 1.1.2.

1.1.1.

T e s t p r o c e d u r e

The headlamp shall be operated for a period according to the specified time, so that:

1.1.1.1.

a) in the case where only one lighting function (driving or passing beam) is to be approved, the

corresponding filament is lit for the prescribed time (1);

b) in the case of a reciprocally incorporated passing lamp and driving lamp (dual filament HSB

headlamp);

If the applicant declares that the headlamp is to be used with a single filament lit (2) at a time, the test
shall be carried out in accordance with this condition, activating (1) each specified function successively
for half the time specified in paragraph 1.1;

In all other cases (1) (2) the headlamp, shall be subjected to the following cycle until the time specified
is reached:

15 minutes, passing-beam filament lit

5 minutes, all filaments lit.

c) in the case of grouped lighting functions all the individual functions shall be lit simultaneously for
the time specified for individual lighting functions (a) also taking into account the use of reciprocally
incorporated lighting functions (b), according to the manufacturer’s specifications.

1.1.1.2.

Test voltage

The voltage shall be adjusted so as to supply 90 % of the maximum wattage specified in this Regulation
for the type(s) of HSB headlamp(s) concerned is (are) obtained.

(1) Should two filaments be simultaneously lit when headlamp flashing is used, this shall not be considered as being normal use of

both filaments simultaneously.

(2) When the tested headlamp is grouped and/ or reciprocally incorporated with signalling lamps, the latter shall be lit for the
duration of the test. In the case of a direction indicator lamp, it shall be lit in flashing operation mode with an on/ off time ratio
of approximately one to one.

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1.1.2.

T e s t r e s u l t s

1.1.2.1.

Visual inspection

Once the headlamp has been stabilised to the ambient temperature, the headlamp lens and the external
lens, if any, shall be cleaned with a clean, damp cotton cloth. It shall then be inspected visually; no
distortion, deformation, cracking or change in colour of either the headlamp lens or the external lens,
if any, shall be noticeable.

1.1.2.2.

Photometric test

To comply with the requirements of this Regulation, the photometric values shall be verified in the
following points:

Passing beam:

50 R — B 50 L — HV for headlamps designed for right-hand traffic,

50 L — B 50 R — HV for headlamps designed for left-hand traffic.

Driving beam

Point of Emax

Another aiming may be carried out to allow for any deformation of the headlamp base due to heat
(the change of the position of the cut-off line is covered in para 2 of this annex);

A 10 % discrepancy between the photometric characteristics and the values measured prior to the test
is permissible including the tolerances of the photometric procedure.

1.2.

Dirty headlamp

After being tested as specified in subparagraph 1.1 above, the headlamp shall be operated for one hour
as described in subparagraph 1.1.1, after being prepared as prescribed in subparagraph 1.2.1, and
checked as prescribed in subparagraph 1.1.2.

1.2.1.

P r e p a r a t i o n o f t h e h e a d l a m p

1.2.1.1.

Test mixture

1.2.1.1.1.

For headlamp with the outside lens in glass:

The mixture of water and a polluting agent to be applied to the headlamp shall be composed of:

— 9 parts by weight of silica sand with a particle size of 0-100 (cid:236)m,

— 1 part by weight of vegetal carbon dust (beechwood) with a particle size of 0-100 (cid:236)m,

— 0,2 part by weight of NaCMC (1), and

— an appropriate quantity of distilled water, with a conductivity of ˜ 1 mS/m.

The mixture must not be more than 14 days old.

1.2.1.1.2.

For headlamp with outside lens in plastic material:

The mixture of water and polluting agent to be applied to the headlamp shall be composed of:

— 9 parts by weight of silica sand with a particle size of 0-100 (cid:236)m,

(1) NaCMC represents the sodium salt of carboxymethylcellulose, customarily referred to as CMC. The NaCMC used in the dirt

mixture shall have a degree of substitution (DS) of 0,6-0,7 and a viscosity of 200-300 cP for a 2 % solution at 20° .

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— 1 part by weight of vegetal carbon dust (beechwood) with a particle size of 0-100 (cid:236)m,

— 0,2 part by weight of NaCMC (1),

— 13 parts by weight of distilled water with a conductivity of ˜ 1 mS/m, and

— 2 ± 1 parts by weight of surface-actant (2).

The mixture must not be more than 14 days old.

1.2.1.2.

Application of the test mixture to the headlamp

The test mixture shall be uniformly applied to the entire light emitting surface of the headlamp and
then left to dry. This procedure shall be repeated until the illumination value has dropped to 15-20 %
of the values measured for each following point under the conditions described in paragraph 1 above:

Point of Emax in driving beam, photometric distribution for a driving/passing lamp,

Point of Emax in driving beam, photometric distribution for a driving lamp only,

50 R and 50 V (3) for a passing lamp only, designed for right-hand traffic,

50 L and 50 V (3) for a passing lamp only, designed for left-hand traffic.

1.2.1.3.

Measuring equipment

The measuring equipment shall be equivalent to that used during headlamp approval tests.

2.

TEST FOR CHANGE IN VERTICAL POSITION OF THE CUT-OFF LINE UNDER THE INFLUENCE OF
HEAT

This test consists of verifying that the vertical drift of the cut-off line under the influence of heat does
not exceed a specified value for an operating passing lamp.

The headlamp tested in accordance with paragraph 1.1, shall be subjected to the test described in 2.1,
without being removed from or readjusted in relation to its test fixture.

2.1.

Test

The test shall be carried out in a dry and still atmosphere at an ambient temperature of 23 °C ± 5 °C.

Using a mass production HSB headlamp which has been aged for at least one hour the headlamp shall
be operated on passing beam without being dismounted from or readjusted in relation to its test
fixture. (For the purpose of this test, the voltage shall be adjusted as specified in para. 1.1.1.2). The
position of the cut-off line in its horizontal part (between vv and the vertical line passing through
point B 50 L for right-hand traffic or B 50 R for left-hand traffic) shall be verified 3 minutes (r3) and
60 minutes (r60) respectively after operation.

The measurement of the variation in the cut-off line position as described above shall be carried out
by any method giving acceptable accuracy and reproducible results.

(1) NaCMC represents the sodium salt of carboxymethylcellulose, customarily referred to as CMC. The NaCMC used in the dirt

mixture shall have a degree of substitution (DS) of 0,6-0,7 and a viscosity of 200-300 cP for a 2 % solution at 20° .
(2) The tolerance on quantity is due to the necessity of obtaining a dirt that correctly spreads out on all the plastic lens.
(3) 50 V is situated 375 mm below HV on the vertical line v-v on the screen at 25 m distance.

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2.2.

2.2.1.

2.2.2.

Test results

The result expressed in milliradians (mrad) shall be considered as acceptable when the absolute value
˜ rI = (r3 — r60) recorded on the headlamp is not more than 1,0 mrad (˜ rI ˜ 1,0 mrad).

However, if this value is more than 1.0 mrad but not more than 1,5 mrad (1,0 mrad ˜ rI ˜ 1,5 mrad)
a second headlamp shall be tested as described in 2.1 after being subjected three consecutive times to
the cycle as described below, in order to stabilise the position of mechanical parts of the headlamp on
a base representative of the correct installation on the vehicle:

operation of
paragraph 1.1.1.2),

the passing lamp for one hour,

(the voltage shall be adjusted as specified in

period of rest for one hour.

The headlamp type shall be considered as acceptable if the mean value of the absolute values ˜ rI
measured on the first sample and ˜ rII measured on the second sample is not more than 1,0 mrad

[(˜rI + ˜rII / 2) ˜ 1,0 mrad].

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ANNEX 7

Requirements for lamps incorporating lenses of plastic material — testing of lens or material samples and
of complete lamps

1.

1.1.

1.2.

1.3.

1.4.

2.

2.1.

GENERAL SPECIFICATIONS

The samples supplied pursuant to paragraph 3.2.4 of this Regulation shall satisfy the specifications
indicated in paragraphs 2.1 to 2.5 below.

Two out of the five samples of complete lamps supplied pursuant to paragraph 3.2.3 of this Regulation
and incorporating lenses of plastic material shall, with regard to the lens material, satisfy the
specifications indicated in paragraph 2.6 below.

The samples of lenses of plastic material or samples of material shall be subjected, with the reflector to
which they are intended to be fitted (where applicable), to approval tests in the chronological order
indicated in table A reproduced in appendix 1 to this annex.

However, if the lamp manufacturer can prove that the product has already passed the tests prescribed
in paragraphs 2.1-2.5 below, or the equivalent tests pursuant to another Regulation, those tests need
not be repeated; only the tests prescribed in appendix 1, table B, shall be mandatory.

TESTS

Resistance to temperature changes

2.1.1.

T e s t s

Three new samples (lenses) shall be subjected to five cycles of temperature and humidity (RH = relative
humidity) change in accordance with the following programme;

— 3 hours at 40 °C ± 2 °C and 85-95 % RH;

— 1 hour at 23 °C ± 5 °C and 60-75 % RH;

— 15 hours at – 30 °C ± 2 °C;

— 1 hour at 23 °C ± 5 °C and 60-75 % RH;

— 3 hours at 80 °C ± 2 °C;

— 1 hour at 23 °C ± 5 °C and 60-75 % RH;

Before this test, the samples shall be kept at 23 °C ± 5 °C and 60-75 % RH for at least four hours.

Note: The periods of one hour at 23 °C ± 5 °C shall include the periods of transition from one

temperature to another which are needed in order to avoid thermal shock effects.

2.1.2.

P h o t o m e t r i c m e a s u r e m e n t s

2.1.2.1.

Method

Photometric measurements shall be carried out on the samples before and after the test. These
measurements shall be made using a standard lamp, at the following points:

— B 50 L and 50 R for the passing beam of a passing lamp or a passing/driving lamp (B 50 R and 50

L in the case of headlamps intended for left-hand traffic);

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— Emax route for the driving beam of a driving lamp or a passing/driving lamp;

2.1.2.2.

Results

The variation between the photometric values measured on each sample before and after the test shall
not exceed 10 % including the tolerances of the photometric procedure.

2.2.

Resistance to atmospheric and chemical agents

2.2.1.

R e s i s t a n c e t o a t m o s p h e r i c a g e n t s

Three new samples (lenses or samples of material) shall be exposed to radiation from a source having
a spectral energy distribution similar to that of a black body at a temperature between 5 500 K and
6 000 K. Appropriate filters shall be placed between the source and the samples so as to reduce as far
as possible radiations with wave lengths smaller than 295 nm and greater than 2 500 nm. The samples
shall be exposed to an energetic illumination of 1 200 W/m2 ± 200 W/m2 for a period such that the
luminous energy that they receive is equal to 4 500 MJ/m2 ± 200 MJ/m2. Within the enclosure, the
temperature measured on the black panel placed on a level with the samples shall be 50 °C ± 5 °C. In
order to ensure a regular exposure, the samples shall revolve around the source of radiation at a speed
between 1 and 5 1/min.

The samples shall be sprayed with distilled water of conductivity lower than 1 mS/m at a temperature
of 23 °C ± 5 °C, in accordance with the following cycle:

— spraying: 5 minutes;

— drying: 25 minutes.

2.2.2.

R e s i s t a n c e t o c h e m i c a l a g e n t s

After the test described in paragraph 2.2.1 above and the measurement described in paragraph 2.2.3.1
below have been carried out, the outer face of the said three samples shall be treated as described in
paragraph 2.2.2.2 with the mixture defined in paragraph 2.2.2.1 below.

2.2.2.1.

Test mixture

The test mixture shall be composed of 61,5 % n-heptane, 12,5 % toluene, 7,5 % ethyl tetrachloride,
12,5 % trichloroethylene and 6 % xylene (volume per cent).

2.2.2.2.

Application of the test mixture

Soak a piece of cotton cloth (as per ISO 105) until saturation with the mixture defined in
paragraph 2.2.2.1 above and, within 10 seconds, apply it for 10 minutes to the outer face of the
sample at a pressure of 50 N/cm2, corresponding to an effort of 100 N applied on a test surface of
14 × 14 mm.

During this 10-minute period, the cloth pad shall be soaked again with the mixture so that the
composition of the liquid applied is continuously identical with that of the test mixture prescribed.

During the period of application, it is permissible to compensate the pressure applied to the sample in
order to prevent it from causing cracks.

2.2.2.3.

Cleaning

At the end of the application of the test mixture, the samples shall be dried in the open air and then
washed with the solution described in paragraph 2.3 (Resistance to detergents) at 23 °C ± 5 °C.

Afterwards the samples shall be carefully rinsed with distilled water containing not more than 0,2 %
impurities at 23 °C ± 5 °C and then wiped off with a soft cloth.

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2.2.3.

R e s u l t s

2.2.3.1.

2.2.3.2.

After the test of resistance to atmospheric agents, the outer face of the samples shall be free from
cracks, scratches, chipping and deformation, and the mean variation in transmission ˜ t = (T2 –
T3)/T2, measured on the three samples according to the procedure described in appendix 2 to this
annex shall not exceed 0,020 (˜ tm ˜ 0,020).

After the test of resistance to chemical agents, the samples shall not bear any traces of chemical
staining likely to cause a variation of flux diffusion, whose mean variation ˜ d = (T5 – T4)/T2, measured
on the three samples according to the procedure described in appendix 4 to this annex shall not
exceed 0,020 (˜ dm ˜ 0,020).

2.3.

Resistance to detergents and hydrocarbons

2.3.1.

R e s i s t a n c e t o d e t e r g e n t s

The outer face of three samples (lenses or samples of material) shall be heated to 50 °C ± 5 °C and
then immersed for five minutes in a mixture maintained at 23 °C ± 5 °C and composed of 99 parts
distilled water containing not more than 0,02 % impurities and one part alkylaryl sulphonate.

At the end of the test, the samples shall be dried at 50 °C ± 5 °C. The surface of the samples shall be
cleaned with a moist cloth.

2.3.2.

R e s i s t a n c e t o h y d r o c a r b o n s

The outer face of these three samples shall then be lightly rubbed for one minute with a cotton cloth
soaked in a mixture composed of 70 % n-heptane and 30 % toluene (volume per cent), and shall then
be dried in the open air.

2.3.3.

R e s u l t s

After the above two tests have been performed successively, the mean value of the variation in
transmission ˜ t = (T2 – T3)/T2, measured on the three samples according to the procedure described
in appendix 2 to this annex shall not exceed 0,010 (˜ tm ˜ 0,010).

2.4.

Resistance to mechanical deterioration

2.4.1.

M e c h a n i c a l d e t e r i o r a t i o n m e t h o d

The outer face of the three new samples (lenses) shall be subjected to the uniform mechanical
deterioration test by the method described in appendix 3 to this annex.

2.4.2.

R e s u l t s

After this test, the variations:

in transmission: ˜ t = (T2 – T3)/T2,

and in diffusion: ˜ t = (T5 – T4)/T2,

shall be measured according to the procedure described in appendix 2 in the area specified in
paragraph 3.2.4.1.1 of this Regulation. The mean value of the three samples shall be such that:

˜ tm ˜ 0,100;

˜ dm ˜ 0,050.

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2.5.

Test of adherence of coatings, if any

2.5.1.

P r e p a r a t i o n o f t h e s a m p l e

A surface of 20 mm × 20 mm in area of the coating of a lens shall be cut with a razor blade or a
needle into a grid of squares approximately 2 mm × 2 mm. The pressure on the blade or needle shall
be sufficient to cut at least the coating.

2.5.2.

D e s c r i p t i o n o f t h e t e s t

Use an adhesive tape with a force adhesion of 2 N/(cm of width) ± 20 % measured under the
standardised conditions specified in appendix 4 to this annex. This adhesive tape, which shall be at
least 25 mm wide, shall be pressed for at least five minutes to the surface prepared as prescribed in
paragraph 2.5.1. Then the end of the adhesive tape shall be loaded in such a way that the force of
adhesion to the surface considered is balanced by a force perpendicular to that surface. At this stage,
the tape shall be torn off at a constant speed of 1,5 m/s ± 0,2 m/s.

2.5.3.

R e s u l t s

There shall be no appreciable impairment of the gridded area. Impairments at the intersections
between squares or at the edges of the cuts shall be permitted, provided that the impaired area does
not exceed 15 per cent of the gridded surface.

2.6.

Tests of the complete lamp incorporating a lens of plastic material

2.6.1.

R e s i s t a n c e t o m e c h a n i c a l d e t e r i o r a t i o n o f t h e l e n s s u r f a c e

2.6.1.1.

Tests

The lens of lamp sample No 1 shall be subjected to the test described in paragraph 2.4.1 above.

2.6.1.2.

Results

After the test, the results of photometric measurements carried out on the lamp in accordance with
this Regulation shall not exceed by more than 30 % the maximum values prescribed at points B 50 L
and HV and not be more than 10 % below the minimum values prescribed at point 75 R (in the case
of headlamps intended for left-hand traffic, the points to be considered are B 50 R, HV and 75 L).

2.6.2.

T e s t o f a d h e r e n c e o f c o a t i n g s , i f a n y

The lens of lamp sample No 2 shall be subjected to the test described in paragraph 2.5 above.

3.

VERIFICATION OF THE CONFORMITY OF PRODUCTION

3.1.

3.1.1.

With regard to the materials used for the manufacture of lenses, the lamps of a series shall be
recognised as complying with this Regulation if:

After the test for resistance to chemical agents and the test for resistance to detergents and
hydrocarbons, the outer face of the samples exhibits no cracks, chipping or deformation visible to the
naked eye (see paras. 2.2.2, 2.3.1 and 2.3.2).

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3.1.2.

After the test described in paragraph 2.6.1.1, the photometric values at the points of measurement
considered in paragraph 2.6.1.2 are within the limits prescribed for conformity of production by this
Regulation.

3.2.

If the test results fail to satisfy the requirements, the tests shall be repeated on another sample of
headlamps selected at random.

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Appendix 1

CHRONOLOGICAL ORDER OF APPROVAL TESTS

A.

Tests on plastic materials (lenses or samples of material supplied pursuant to paragraph 3.2.4 of this
Regulation)

Samples

Tests

Lenses or samples
of material

Lenses

1 2 3 4 5 6 7 8 9 10 11 12 13

1.1.

1.1.1.

1.1.2.

1.2.1.

1.2.2.

1.3.

1.3.1.

1.4.

1.4.1.

1.5.

1.6.

1.6.1.

1.7.

1.7.1.

1.7.2.

1.8.

Limited photometry (paragraph 2.1.2)

Temperature change (paragraph 2.1.1)

Limited photometry (paragraph 2.1.2)

X X X

X X X

X X X

Transmission measurement

X X X X X X X X X

Diffusion measurement

Atmospheric agents (paragraph 2.2.1)

Transmission measurement

Chemicals agents (paragraph 2.2.2)

Diffusion measurement

Detergents (paragraph 2.3.1)

Hydrocarbons (paragraph 2.3.2)

Transmission measurement

Deterioration (paragraph 2.4.1)

Transmission measurement

Diffusion measurement

Adherence (paragraph 2.5)

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X

B.

Tests on complete lamps (supplied pursuant to paragraph 3.2.3 of this Regulation)

Tests

2.1.

2.2.

2.3.

Deterioration (paragraph 2.6.1.1)

Photometry (paragraph 2.6.1.2)

Adherence (paragraph 2.6.2)

Complete headlamp

Sample No

1

X

X

2

X

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Appendix 2

METHOD OF MEASUREMENT OF THE DIFFUSION AND TRANSMISSION OF LIGHT

1.

EQUIPMENT (see figure)

The beam of a collimator K with a half divergence (cid:226)/2 = 17,4 × 10-4 rd is limited by a diaphragm DT with an
opening of 6 mm against which the sample stand is placed.

A convergent achromatic lens L2, corrected for spherical aberrations, links the diaphragm DT with the receiver
R; the diameter of the lens L2 shall be such that it does not diaphragm the light diffused by the sample in a
cone with a half top angle of (cid:226)/2 = 14°.

An annular diaphragm DD with angles Æa/2 = 1° and Æmax/2 = 12° is placed in an image focal plane of the lens
L2.

The non-transparent central part of the diaphragm is necessary in order to eliminate the light arriving directly
from the light source. It shall be possible to remove the central part of the diaphragm from the light beam in
such a manner that it returns exactly to its original position.

The distance L2 DT and the focal length F2 (1) of the lens L2 shall be so chosen that the image of DT completely
covers the receiver R.

When the initial incident flux is referred to 1 000 units, the absolute precision of each reading shall be better
than 1 unit.

2. MEASUREMENTS

The following readings shall be taken:

Reading

With sample

With central part of DD

Quantity represented

T1

T2

T3

T4

T5

No

Yes (before test)

Yes (after test)

Yes (before test)

Yes (after test)

No

No

No

Yes

Yes

Incident flux in initial reading

Flux transmitted by the new material in a field of
24 °C

Flux transmitted by the tested material in a field of
24 °C

Flux diffused by the new material

Flux diffused by the tested material

(1) For L2 it is recommended to use a focal distance of about 80 mm.

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Appendix 3

SPRAY TESTING METHOD

1.

TEST EQUIPMENT

1.1.

Spray gun

The spray gun used shall be equipped with a nozzle 1,3 mm in diameter allowing a liquid flow rate of
0,24 ± 0,02 1/minute at an operating pressure of 6,0 bars — 0, + 0,5 bar.

Under these operation conditions the fan pattern obtained shall be 170 mm ± 50 mm in diameter on
the surface exposed to deterioration, at a distance of 380 mm ± 10 mm from the nozzle.

1.2.

Test mixture

The test mixture shall be composed of:

— Silica sand of hardness 7 on the Mohr scale, with a grain size between 0 and 0,2 mm and an

almost normal distribution, with an angular factor of 1,8 to 2;

— Water of hardness not exceeding 205 g/m3 for a mixture comprising 25 g of sand per litre of

water.

2.

TEST

The outer surface of the lamp lenses shall be subjected once or more than once to the action of the
sand jet produced as described above. The jet shall be sprayed almost perpendicular to the surface to
be tested.

The deterioration shall be checked by means of one or more samples of glass placed as a reference
near the lenses to be tested. The mixture shall be sprayed until the variation in the diffusion of light on
the sample or samples measured by the method described in appendix 4, in such that:

˜d = (T5 – T4)/T2 = 0,0250 ± 0,0025.

Several reference samples may be used to check that the whole surface to be tested has deteriorated
homogeneously.

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Appendix 4

ADHESIVE TAPE ADHERENCE TEST

1.

2.

3.

4.

PURPOSE

This method allows to determine under standard conditions the linear force of adhesion of an adhesive
tape to a glass plate.

PRINCIPLE

Measurement of the force necessary to unstick an adhesive tape from a glass plate at an angle of 90°.

SPECIFIED ATMOSPHERIC CONDITIONS

The ambient conditions shall be at 23 °C ± 5 °C and 65 ± 15 % relative humidity (RH).

TEST PIECES

Before the test, the sample roll of adhesive tape shall be conditioned for 24 hours in the specified
atmosphere (see para. 3 above).

Five test pieces each 400 mm long shall be tested from each roll. These test pieces shall be taken from
the roll after the first three turns were discarded.

5.

PROCEDURE

The test shall be under the ambient conditions specified in paragraph 3.

Take the five test pieces while unrolling the tape radially at a speed of approximately 300 mm/s, then
apply them within 15 seconds in the following manner:

Apply the tape to the glass plate progressively with a slight length wise rubbing movement of the
finger, without excessive pressure, in such a manner as to leave no air bubble between the tape and
the glass plate.

Leave the assembly in the specified atmospheric conditions for 10 minutes.

Unstick about 25 mm of the test piece from the plate in a plane perpendicular to the axis of the test
piece.

Fix the plate and fold back the free end of the tape at 90°. Apply force in such a manner that the
separation line between the tape and the plate is perpendicular to this force and perpendicular to the
plate.

Pull to unstick at a speed of 300 mm/s ± 30 mm/s and record the force required.

6.

RESULTS

The five values obtained shall be arranged in order and the median value taken as the result of the
measurement. This value shall be expressed in Newtons per centimetre of width of the tape.

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ANNEX 8

Minimum requirements for sampling by an inspector

1.

1.1.

1.2.

GENERAL

The conformity requirements shall be considered satisfied from a mechanical and a geometric
standpoint, in accordance with the requirements of this Regulation, if any, if the differences do not
exceed inevitable manufacturing deviations.

With respect to photometric performance, the conformity of mass produced headlamps shall not be
contested if, when testing photometric performances of any headlamp chosen at random;

1.2.1.

no measured value deviates unfavourably by more than 20 per cent from the values prescribed in this
Regulation. For values B 50 L (or R) and Zone III the maximum deviation may be respectively:

B 50 L (or R) 0,2 lx equivalent 20 per cent

0,3 lx equivalent 30 per cent

Zone III 0,3 lx equivalent 20 per cent

0,45 lx equivalent 30 per cent

1.2.2.

or if

1.2.2.1.

1.2.2.2.

for the passing beam, the values prescribed in this Regulation are met at HV (with a tolerance of 0,2 lx)
and related to that aiming at least one point of each area delimited on the measuring screen (at 25 m)
by a circle 15 cm in radius around points B 50 L (or R) (1) (with a tolerance of 0,1 lx), 75 R (or L),
50 V, 25 R, 25 L, and in the entire area of zone IV which is not more than 22,5 cm above line 25 R
and 25 L;

and if, for the driving beam, HV being situated within the isolux 0,75 Emax, a tolerance of + 20 per
cent for maximum values and – 20 per cent for minimum values is observed for the photometric
values at any measuring point specified in paragraph 8.3 of this Regulation. The reference mark is
disregarded.

1.2.3.

If the results of the tests described above do not meet the requirements, the alignment of the headlamp
may be changed, provided that the axis of the beam is not displaced laterally by more than 1° to the
right or left (2).

1.2.4.

Headlamps with apparent defects are disregarded.

1.2.5.

The reference mark is disregarded.

1.3.

The chromaticity coordinates shall be complied with.

The photometric performance of a headlamp emitting selective yellow light shall be the values
contained in this Regulation multiplied by 0,84.

(1) Letters in brackets refer to headlamps intended for left-hand traffic.
(2) See the corresponding footnote (note 4, p. 53) in the text of the Regulation.

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2.

FIRST SAMPLING

In the first sampling four headlamps are selected at random. The first sample of two is marked A, the
second sample of two is marked B.

2.1.

The conformity is not contested.

2.1.1.

Following the sampling procedure shown in Figure 1 of this annex the conformity of mass-produced
headlamps shall not be contested if the deviation of the measured values of the headlamps in the
unfavourable directions are:

2.1.1.1.

sample A

A1 one headlamp 0 per cent one headlamp not more than 20 per cent

A2 both headlamps more than 0 per cent

but not more than 20 per cent

go to sample B

2.1.1.2.

sample B

B1 both headlamps 0 per cent

2.1.2.

or if the conditions of paragraph 1.2.2 for sample A are fulfilled.

2.2.

The conformity is contested.

2.2.1.

Following the sampling procedure shown in Figure 1 of this annex the conformity of mass-produced
headlamps shall be contested and the manufacturer requested to make his production meet the
requirements (alignment) if the deviations of the measured values of the headlamps are:

2.2.1.1.

sample A

A3 one headlamp not more than 20 per cent

one headlamp more than 20 per cent

but not more than 30 per cent

2.2.1.2.

sample B

B2 in the case of A2

one headlamp more than 0 per cent

but not more than 20 per cent

one headlamp not more than 20 per cent

B3 in the case of A2

one headlamp 0 per cent

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one headlamp more than 20 per cent

but not more than 30 per cent

2.2.2.

or if the conditions of paragraph 1.2.2 for sample A are not fulfilled.

2.3.

Approval withdrawn

Conformity shall be contested and paragraph 12 applied if, following the sampling procedure in
Figure 1 of this annex deviations of the measured values of the headlamps are:

2.3.1.

sample A

A4 one headlamp not more than 20 per cent

one headlamp more than 30 per cent

A5 both headlamps more than 20 per cent

2.3.2.

sample B

B4 in the case of A2

one headlamp more than 0 per cent

but not more than 20 per cent

one headlamp not more than 20 per cent

B5 in the case of A2

both headlamps more than 20 per cent

B6 in the case of A2

one headlamp 0 per cent

one headlamp more than 30 per cent

2.3.3.

or if the conditions of paragraph 1.2.2 for samples A and B are not fulfilled.

3.

REPEATED SAMPLING

In the cases of A3, B2, B3 a repeated sampling, third sample C of two headlamps and fourth sample D
of two headlamps, selected from stock manufactured after alignment, is necessary within two months
time after the notification.

3.1.

The conformity is not contested.

3.1.1.

Following the sampling procedure shown in Figure 1 of this annex the conformity of mass-produced
headlamps shall not be contested if the deviations of the measured values of the headlamps are:

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3.1.1.1.

sample C

C1 one headlamp 0 per cent

one headlamp not more than 20 per cent

C2 both headlamps more than 0 per cent

but not more than 20 per cent

go to sample D

3.1.1.2.

sample D

D1 in the case of C2

both headlamps 0 per cent

3.1.2.

or if the conditions of paragraph 1.2.2 for sample C are fulfilled.

3.2.

The conformity is contested.

3.2.1.

Following the sampling procedure shown in Figure 1 of this annex the conformity of mass-produced
headlamps shall be contested and the manufacturer requested to make his production meet the
requirements (alignment) if the deviations of the measured values of the headlamps are:

3.2.1.1.

sample D

D2 in the case of C2

one headlamp more than 0 per cent

but not more than 20 per cent

one headlamp not more than 20 per cent

3.2.1.2.

or if the conditions of paragraph 1.2.2 for sample C are not fulfilled:

3.3.

Approval withdrawn

Conformity shall be contested and paragraph 12 applied if, following the sampling procedure in
Figure 1 of this annex, the deviations of the measured values of the headlamps are:

3.3.1.

sample C

C3 one headlamp not more than 20 per cent

one headlamp more than 20 per cent

C4 both headlamps more than 20 per cent

3.3.2.

sample D

D3 in the case of C2

one headlamp 0 or more than 0 per cent

one headlamp more than 20 per cent

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3.3.3.

or if the conditions of paragraph 1.2.2 for samples C and D are not fulfilled.

4.

CHANGE OF THE VERTICAL POSITION OF THE CUT-OFF LINE

With respect to the verification of the change in vertical positions of the cut-off line under the
influence of heat, the following procedure shall be applied:

One of the headlamps of sample A after sampling procedure in Figure 1 of this annex shall be tested
according to the procedure described in paragraph 2.1 of annex 6 after being subjected three
consecutive times to the cycle described in paragraph 2.2.2 of annex 6.

The headlamp shall be considered as acceptable if ˜ r does not exceed 1,5 mrad.

If this value exceeds 1,5 mrad but is not more than 2,0 mrad, the second headlamp of sample A shall
be subjected to the test after which the mean of the absolute values recorded in both samples shall not
exceed 1,5 mrad.

However, it this value of 1,5 mrad on sample A is not complied with, the two headlamps of sample B
shall be subjected to the same procedure and the value of ˜ r for each of them shall not exceed
1,5 mrad.

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Figure 1