Document ID: chunk:federal_register_of_legislation:F2023C00141:reg:1:p8
Version: federal_register_of_legislation:F2023C00141
Segment Type: reg
Provision Reference: reg 1 (pt 8/14)
Character Range: 46103–49313

reference centre of the lamp is comprised between 10 minutes and 1 degree;
                  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.
              3.                                     In the case where the device may be installed on the vehicle in more than one or in a field of different positions the photometric measurements shall be repeated for each position or for the extreme positions of the field of the reference axis specified by the manufacturer.
              4.                                     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
              1.                                     SM1 category of side-marker lamps

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

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 Type Approval 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.
2.5.                                    However in the case where a device is intended to be installed with its H plane at a mounting height less than 750 mm above the ground, the photometric intensity is verified only up to an angle of 5° downwards.
3.                                          Photometric measurement of lamps
    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 the relevant subparagraph of paragraph 9.1. of this Regulation.
3.2.                                    For replaceable light sources:
When equipped with light sources at 6.75 V, 13.5 V or 28.0 V, the luminous intensity values produced shall be corrected. For filament lamps the correction factor is the ratio between the reference luminous flux and the mean value of the luminous flux found at the voltage applied (6.75 V, 13.5 V or 28.0 V).
For LED light sources the correction factor is the ratio between the objective luminous flux and the mean value of the luminous flux found at the voltage applied