Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p77
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 207653–210409

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 proving a driving beam only, it shall be so adjusted that the area of maximum illumination is centred on the point of intersection of the lines hh and vv; such a headlamp need meet only the requirements referred to in paragraph 6.3.

       6.3.2. 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 the lines hh and vv shall be situated within the isolux representing 80% of maximum illumination. This maximum value (EM) shall be not less than 48lux. The maximum value shall in no case exceed 240 lux; moreover, 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 75R (or 75L).

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

       IM = 0.625 EM

       6.3.2.1.2. the reference mark (IM) indicating this maximum intensity and referred to in paragraph 4.2.2.7. above shall be obtained by means of the formula:

       this value shall be rounded to whichever is the nearest of the following: 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 24 lux up to a distance of 1.125m and not less than 6 lux up to a distance of 2.25m.

       6.4. In the case of headlamps with an 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 the aiming screen.  The adjustable reflector   is then moved into such a position that the light pattern on the screen corresponds to the aiming prescriptions of paragraphs 6.2.1. to 6.2.2.3. and/or 6.3.1.;

       6.4.2. with the reflector initially fixed according to paragraph 6.4.1., the headlamp must meet the relevant photometric requirements of paragraphs 6.2. and 6.3.;

       6.4.3. additional tests are 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 headlamps adjusting device.  Having re-aimed the headlamp as a whole (by means of the goniometer for example) in the