Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p39
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 121457–124777

lamp is hidden by any further parts of the vehicle, proof shall be furnished that the part of the lamp not hidden by obstacles still conforms to the photometric values prescribed for the approval of the device.
5.28.4.                          When the vertical angle of geometric visibility below the horizontal may be reduced to 5º (lamp at less than 750 mm above the ground measured according to the provisions of paragraph 5.8.1. above) the photometric field of measurements of the installed optical unit may be reduced to 5º below the horizontal.
5.28.5.                          In the case of an interdependent lamp system, the geometric visibility requirements shall be fulfilled when all its interdependent lamps are operated together.
5.29.                                A LED module does not need to be replaceable, if so stated in the communication sheet of the component type approval.
6.                                          Individual specifications
6.1.                                    Main beam headlamp (Regulations Nos. 98 and 112)
6.1.1.                              Presence
Mandatory on motor vehicles. Prohibited on trailers.
6.1.2.                              Number
Two or four, type approved according to Regulations Nos. 98 or 112, excluding Class A headlamp.
For vehicles of the category N3: Two extra main-beam headlamps may be installed.
Where a vehicle is fitted with four concealable headlamps, the installation of two additional headlamps shall only be authorized for the purpose of light-signalling, consisting of intermittent illumination, at short intervals (see paragraph 5.12. above) in daylight.
6.1.3.                              Arrangement
No individual specifications.
6.1.4.                              Position
6.1.4.1.                        In width: No individual specifications.
6.1.4.2.                        In height: No individual specifications.
6.1.4.3.                        In length: At the front of the vehicle. This requirement shall be deemed to be satisfied if the light emitted does not cause discomfort to the driver either directly or indirectly through the devices for indirect vision and/or other reflecting surfaces of the vehicle.
6.1.5.                              Geometric visibility
The visibility of the illuminating surface, including its visibility in areas which do not appear to be illuminated in the direction of observation considered, shall be ensured within a divergent space defined by generating lines based on the perimeter of the illuminating surface and forming an angle of not less than 5° with the axis of reference of the headlamp. The origin of the angles of geometric visibility is the perimeter of the projection of the illuminating surface on a transverse plane tangent to the foremost part of the lens of the headlamp.
6.1.6.                              Orientation
Towards the front.
Not more than one main-beam headlamp on each side of the vehicle may swivel to produce bend lighting.
6.1.7.                              Electrical connections
6.1.7.1.              Except when they are used to give intermittent luminous warnings at short intervals the main-beam headlamps may be switched ON, only when the master light switch is in headlamps ON position or in "AUTO" (automatic) position and the conditions