Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p74
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 199070–202442

headlamp from one position to the other or its setting in an intermediate position.  Where two different setting positions are provided for the filament lamp, the components attaching the filament lamp to the reflector must be so designed and made that, in each   of its two settings, the filament lamp will be held in position with the precision required for headlamps intended for traffic on only one side of the road.  Conformity with the requirements of this paragraph shall be verified visually and, where necessary, by a test fitting.

       5.5. On headlamps designed to provide alternately a driving beam and a passing beam, any mechanical,  electromechanical  or  other  device  incorporated  in  the  headlamp  for switching from one beam to the other [9/] must be so constructed that:

       5.5.1. the device is strong enough to be worked 50,000 times without suffering damage despite the vibration to which it may be subjected in normal use;

       5.5.2. in the case of failure it is possible to obtain the passing beam automatically;

       5.5.3. either the passing beam or the driving beam can always be obtained without any possibility of the mechanism stopping in between the two positions;

       5.5.4. the user cannot, with ordinary tools, change the shape or position of the moving parts.

       5.6. Complementary tests shall be done according to the requirements of Annex 5 to ensure that in use there is no excessive change in photometric performance.

       5.7. If the lens of the headlamp is of plastic material, tests shall be done according to the requirements of Annex 6.

6. ILLUMINATION

       6.1. General provisions

       6.1.1. Headlamps shall be so made that with suitable H1, H2, H3, HB3, HB4, H7, H8, H9, HIR1 and/or HIR2 filament lamps they provide adequate illumination without dazzle in the case of the passing beam and good illumination in the case of the driving beam.

       6.1.2. The illumination produced by the headlamp shall be checked on a vertical screen set at a distance of 25m in front of the headlamp and at right angles to its axis (see Annex 4).

       6.1.3. The headlamps shall be checked by means of (a) standard (reference) filament lamp(s) designed for a rated voltage of 12V, any selective-yellow filters[10/] being replaced by geometrically identical uncoloured filters with a transmission factor of at least 80%. During the checking of the headlamp the voltage at the terminals of the filament lamp must be regulated so as to obtain the following characteristics:

Filament lamps  Approximate supply voltage (in V) for measurement  Light flux (in lumens)
H               12                                                 1,150
H2              12                                                 1,300
H3              12                                                 1,100
HB3             12                                                 1,300
HB4             12                                                 825
H7              12                                                 1,100
H8              12                                                 600
HIR1            12                                                 1,840
HIR2            12                                                 1,355
H9              12                                                 1,500

       The