Document ID: chunk:federal_register_of_legislation:F2023C00228:reg:1:p17
Version: federal_register_of_legislation:F2023C00228
Segment Type: reg
Provision Reference: reg 1 (pt 17/35)
Character Range: 490127–492748

source, the headlamp shall continue to fulfil the requirements of the passing beam.

        6.3. Provisions concerning driving beams

        6.3.1. In the case of a headlamp designed to provide a driving beam and a passing beam, measurements of the illumination produced on the screen by the driving beam shall be taken with the same headlamp alignment as for measurements under paragraphs 6.2.5. to 6.2.7. above; in the case of a headlamp providing a driving beam only, it shall be so adjusted that the area of maximum illumination is centred on the point of intersection of lines hh and vv; such a headlamp need meet only the requirements referred to in paragraph 6.3.

        6.3.2. It is possible to use several light sources for the driving beam.

        6.3.3. The illumination produced on the screen by the driving beam shall meet the following requirements.

        6.3.3.1. The point of intersection (HV) of lines hh and vv 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 A headlamps and 48 lux for Class B headlamps.  The maximum value shall in no circumstances exceed 240 lux; in addition, in the case of a combined passing and driving headlamp, this maximum value shall not be more than 16 times the illumination measured for the passing beam at point 75 R (or 75 L).

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

         IM = 0.625 EM

        6.3.3.1.2. The reference mark (I'M) of this maximum intensity, referred to in paragraph 4.2.2.7. 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.

        6.3.3.2. Starting from point HV, horizontally to the right and left, the illumination shall be not less than 16 lux for Class A headlamp and 24 lux for Class B headlamp up to a distance of 1.125 m and not less than 4 lux for Class A headlamp and 6 lux for Class B headlamp up to a distance of 2.25 m.

        6.4. In the case of headlamps with adjustable reflector the requirements of paragraphs 6.2. and 6.3. are applicable for each mounting position indicated according to paragraph 2.1.3.  For verification the following procedure shall be used:

        6.4.1. Each applied position is realized on the test goniometer with respect to a line joining the centre of the light source and point HV on a aiming screen.  The adjustable reflector is then moved into such a position that the light pattern on the