Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p107
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 289139–292053

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 designed for traffic on only one side of the road. Conformity with the requirements  of  this  paragraph  shall  be  verified  by  visual  inspection  and,  where necessary, by a test fitting.

       5.5. Complementary tests shall be done according to the requirements of annex 4 to ensure that in use there is no excessive change in photometric performance.

       5.6. 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 H4 filament lamps they give adequate illumination without dazzle when emitting the passing beam, and good illumination when emitting the driving beam.

       6.1.2. The illumination produced by the headlamp shall be determined by means of a vertical screen set up 25 m forward of the headlamp and at right angles to its axes as shown in annex 3 to this Regulation.

       6.1.3. The headlamps shall be checked by means of an uncoloured standard (reference) filament lamp designed for a rated voltage of 12 V. In the case of headlamps which may be fitted with selective-yellow filters, [8/] such filters shall be 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:

                  Consumption in Watts  Light flux in lumens
Passing filament  About 55              750
Driving filament  About 60              1,250

       The headlamp shall be considered acceptable if it meets the requirements of this paragraph 6 with at least one standard (reference) filament lamp, which may be submitted with the headlamp.

       6.1.4. The dimensions determining the position of the filaments inside the standard filament lamp are shown in the relevant data sheets of Regulation No. 37.

       6.1.5. The bulb of the standard filament lamp must be of such shape and optical quality that it does not cause any reflection or refraction adversely affecting the light distribution. Compliance with this requirement shall be checked by measuring the light distribution obtained when a standard (reference) headlamp is fitted with the standard (reference) filament lamp (see paragraph 9 below).

       6.2. Provisions concerning passing beams

       6.2.1. The passing beam must produce a sufficiently sharp "cut-off" to permit a satisfactory adjustment with its aid.  The "cut-off" must be a horizontal straight line on the side opposite to the direction of the traffic for which the headlamp is intended; on the other side, it must not extend beyond either the broken line HV