Technical requirements of Regulation No 91 of the United Nations' Economic Commission for Europe referred to in Article 3 and in Annex IV, item 2 of Commission Directive 97/30/EC (1) adapting to technical progress Council Directive 76/758/EEC relating to the end-outline marker lamps, front position (side) lamps, rear position (side) lamps, stop lamps, daytime running lamps and side marker lamps for motor vehicles and their trailers

2. DEFINITIONS

2.1. The definitions given in Regulation No 48 and the series of amendments in force at the time of application for type approval shall apply to this Regulation.

2.2. 'Side-marker lamp` means a lamp used to indicate the presence of the vehicle when viewed from the side;

2.3. 'Type,` in relation to side-marker lamps, means side-marker lamps which do not differ in such essential respects as:

2.3.1. he trade name or mark;

2.3.2. the characteristics of the optical system (level of intensity, light distribution angles, type of filament lamp, etc.).

6. GENERAL SPECIFICATIONS

6.1. Each side-marker lamp submitted for approval shall conform to the specifications set out in paragraphs 7 and 8 of this Regulation.

6.2. Side-marker lamps 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.

7. INTENSITY OF LIGHT EMITTED

7.1. The intensity of the light emitted by each of the two samples submitted shall be:

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7.1.4. In the case of a lamp containing more than one light source:

the lamp shall comply with the minimum intensity required when any one light source has failed;

when all light sources are illuminated the maximum intensity specified may not be exceeded.

7.2. Outside the reference axis and within the angular fields defined in the diagrams in annex 1 to this Regulation, the intensity of the light emitted by each of the two side-marker lamps supplied must:

7.2.1. In each direction corresponding to the points in the light distribution table reproduced in annex 4 to this Regulation, be not less than the product of the minimum specified in paragraph 7.1 above by the percentage specified in the said table for the direction in question;

7.2.2. In no direction within the space from which the side-marker lamp is visible, exceed the maximum specified in paragraph 7.1 above;

7.2.3. The provisions of paragraph 2.2 of annex 4 to this Regulation on local variations of intensity must be observed.

7.3. Annex 4, to which reference is made in paragraph 7.2.1 above, gives particulars of the measurement methods to be used.

8. COLOUR OF LIGHT EMITTED

8.1. The side-marker lamp must emit amber light; however it can emit red, if the rearmost side-marker lamp is grouped or combined or reciprocally incorporated with the rear position lamp, the rear end-outline marker lamp, the rear fog lamp, the stop lamp, or is grouped with or has part of the light emitting surface in common with the rear retro-reflector.

8.2. The colour of the light emitted must be within the limits of the trichromatic coordinates prescribed for the colour in question in annex 5 to this Regulation.

9. TEST PROCEDURE

9.1. Measurements shall be carried out with a colourless standard filament lamp of the type recommended for the side-marker lamp and so regulated as to produce the reference luminous flux prescribed for this type of lamp, taking into account the provisions of paragraph 9.2 below.

9.2. All measurements on lamps equipped with non-replaceable light sources (filament lamps and other) shall be made at 6.75 V, 13.5 V or 28.0 V respectively.

In the case of light sources supplied by a special power supply, the above test voltages shall be applied to the input terminals of that power supply. The test laboratory may require from the manufacturer the special power supply needed to supply the light sources.

(1) OJ No L 171, 30. 6. 1997, p. 25.

ANNEX 1

Minimum angles required for light distribution in space

Minimum vertical angles, SM1 and SM2:

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Minimum horizontal angles, SM1:

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Minimum horizontal angles, SM2:

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ANNEX 4

Photometric measurements

1. MEASUREMENT METHODS

1.1. During photometric measurement stray reflections shall be avoided by appropriate marking.

1.2. In case the results of measurements should be challenged, measurements shall be carried out in such a way as to meet the following requirements:

1.2.1. The distance of measurement shall be such that the law of the inverse of the square of the distance is applicable;

1.2.2. The measuring equipment shall be such that the angular aperture of the receiver viewed from the reference centre of the lamp is comprised between 10 minutes and 1 degree;

1.2.3. The intensity requirement for a particular direction of observation shall be deemed to be satisfied if that requirement is met in a direction deviating by not more than one-quarter of a degree from the direction of observation.

1.3. The direction H = 0° and V = 0° corresponds to the reference axis. (On the vehicle it is horizontal, perpendicular to the median longitudinal plane of the vehicle and oriented in the required direction of visibility.) It passes through the centre of reference.

2. TABLES OF LIGHT DISTRIBUTION

2.1. SM1 category of side-marker lamps

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2.1.1. Minimum values:

0.6 cd at any point other than the reference axis, at which it shall be 4.0 cd.

2.1.2. Maximum values:

25.0 cd at any point

2.2. SM2 category of side-marker lamps

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2.2.1. Minimum values:

0.6 cd, at any point

2.2.2. Maximum values:

25.0 cd, at any point

2.3. For SM1 and SM2 category of side-marker lamps it may be sufficient to check only five points selected by the test authority.

2.4. Within the field of light distribution shown above as a grid the light pattern should be substantially uniform, i.e. the light intensity in every direction within a part of the field formed by the grid lines shall meet at least the lowest minimum value applicable to the respective grid lines.

3. PHOTOMETRIC MEASUREMENT OF LAMPS EQUIPPED WITH SEVERAL LIGHT SOURCES

The photometric performance shall be checked:

3.1. For non-replaceable light sources (filament lamps and other):

with the light sources present in the lamp, in accordance with paragraph 9.2. of this Regulation;

3.2. For replaceable filament lamps:

When equipped with mass production filament lamps at 13.5 V or 28 V, the luminous intensity values produced shall lie between the maximum limit given in this Regulation and the minimum limit of this Regulation increased according to the permissible deviation of the luminous flux permitted for the type of filament lamp chosen, as stated in Regulation No 37 for production filament lamps; alternatively, a standard filament lamp may be used in turn, in each of the individual positions, operated at its reference flux, the individual measurements in each position being added together.

ANNEX 5

Colour of light emitted: lights for trichromatic coordinates

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For checking these colorimetric characteristics, a source of light at a colour temperature of 2,856 K, corresponding to illuminant A of the International Commission on Illumination (CIE), shall be used. However, for lamps equipped with non-replaceable light sources (filament lamps and other), the colorimetric characteristics should be verified with the light sources present in the lamp, in accordance with paragraph 9.2. of this Regulation.