Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p110
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 296910–299727

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).

       6.3.2.1.1. 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 4.2.2.7. above, shall be obtained by the ratio

       This value shall be rounded off to the value 7.5 12.5 - 17.5 25 - 27.5 37.5 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 1.125 m and not less than 6 lux up to a distance of 2.25 m.

       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 corresponding opposite direction the light output in the following directions shall be controlled and lie within the required limits: passing beam: points HV and 75R (75L respectively);

       driving beam:IM and point HV (percentage of IM).

       6.4.4. if  the  applicant  has indicated  more than  one  mounting  position  the  procedure  of paragraphs 6.4.1. to 6.4.3. shall be repeated for all the other positions;

       6.4.5. if the applicant has not asked for special mounting positions, the headlamp shall be  aimed for measurements of paragraphs 6.2. and 6.3. with the headlamps adjusting device in its mean position. The additional tests of paragraph 6.4.3. shall be made with the reflector moved into its extreme positions (instead of +/-2 degrees) by means of the headlamps adjusting device.

       6.5. The screen illumination values mentioned in paragraphs 6.2.5. to 6.2.7. and 6.3. above shall be measured