Document ID: chunk:federal_register_of_legislation:F2021C00466:body:0:p12
Version: federal_register_of_legislation:F2021C00466
Segment Type: other
Provision Reference: 
Character Range: 32672–35700

Annex 2

    Examples of arrangements of the approval marks

The lamp bearing the above approval mark has been approved in the Netherlands (E 4) pursuant to Regulation No. 77 under the approval number 002439.  The first two digits of the approval number indicate that the approval was granted according to the requirements of Regulation No. 77 in its original form.  The vertical arrow starting from a horizontal segment and directed downwards indicates a permissible mounting height of equal to or less than 750 mm from the ground for this device.

Light source modules

MD E3 17325

The light source module bearing the identification code shown above has been approved together with a lamp approved in Italy (E 3) under approval number 17325.
Annex 3
Minimum angles required for the light distribution in space[7]

In all cases, the minimum vertical angles of light distribution in space are 15° above and 15° below the horizontal except for lamps intended to be installed with their H plane at a mounting height less than 750 mm above the ground, for which they are 15° above and 5° below the horizontal.

Annex 4
Photometric measurements

          1. Measurement methods
              1.                                     During photometric measurements, stray reflections shall be prevented by appropriate masking.
              2.                                     Should the results of measurements be challenged, measurements shall be carried out in such a way as to meet the following requirements:
                  1.                               The distance of measurements shall be such that the law of the inverse of the square of the distance is applicable;
                  2.                               The measuring equipment shall be such that the angular aperture of the receiver viewed from the reference centre of the light is between 10' and 1°;
                  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 15' 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.
          2. Standard luminous intensity distribution table
2.1.                                    The direction H = 0° and V = 0° corresponds to the reference axis. (On the vehicle it is horizontal, parallel to the median longitudinal plane of the vehicle and oriented in the required direction of visibility.)  It passes through the centre of reference.  The values shown in the table give, for the various directions of measurements, the minimum intensities as a percentage of the minimum required in the axis for each lamp (in the direction H = 0° and V =