Document ID: chunk:federal_register_of_legislation:F2023C00228:reg:8:p2
Version: federal_register_of_legislation:F2023C00228
Segment Type: reg
Provision Reference: reg 8 (pt 2/7)
Character Range: 579428–582005

A headlamp, the illumination produced on the screen by the driving beam shall meet the following requirements:

       6.3.2.1. The point of intersection (HV) of lines H-H and V-V shall be situated within the isolux 80 per cent of maximum illumination.  This maximum value (EM) shall not be less than 32 lux for Class B or C headlamps and 51.2 lux for Class D headlamps.  The maximum value shall in no circumstances exceed 240 lux in the case of Class B headlamps and 180 lux in the case of Class C and D headlamps.

       6.3.2.1.1. The maximum intensity (IM) of the driving beam expressed in thousands of candelas shall be calculated by the formula:

           IM = 0.625 EM

       6.3.2.1.2. The reference mark (I'M) of this maximum intensity, referred to in paragraph 4.2.2.6. above, shall be obtained by the ratio:

       This value shall be rounded off to the value 7.5 - 10 - 12.5 - 17.5 - 20 - 25 - 27.5 - 30 - 37.5 - 40 - 45 - 50.

       6.3.2.2. Starting from point HV, horizontally to the right and left, the illumination shall be not less than 12 lux for Class B headlamp to a distance of 1,125 mm and not less than 3 lux for Class B headlamp to a distance of 2,250 mm.

       In the case of a Class C or D headlamp, the intensities shall conform to the tables A or B in Annex 3.  Table A applies in the case where a primary driving beam is being produced with a single light source.  Table B applies in the case where the driving beam is being produced by a secondary driving beam headlamp operated with a harmonized passing beam headlamp or a primary driving beam headlamp.

       6.4. In the case of headlamps with an adjustable reflector, additional tests shall be made after the reflector has been moved vertically ± 2 degrees or at least into the maximum position, if less than 2 degrees, from its initial position by means of the headlamp adjusting device. The whole headlamp shall then be re-positioned (for example by means of the goniometer) by moving it through the same number of degrees in the opposite direction to the movement of the reflector.  The following measurements shall be made and the points shall be within the required limits:
       passing beam: points HV and 0.86D-V
       driving beam: IM and point HV (percentage of IM)

       6.5. The screen illumination values mentioned in paragraphs 6.2. and 6.3. above shall be measured by means of a photoreceptor, the effective area of which shall be contained within a square of 65 mm side.

       7. COLOUR

       7.1. The colour of the light emitted shall be white. Expressed in