Document ID: chunk:federal_register_of_legislation:F2023C00228:reg:1:p18
Version: federal_register_of_legislation:F2023C00228
Segment Type: reg
Provision Reference: reg 1 (pt 18/35)
Character Range: 492531–495422

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 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° or at least into the maximum position, if less than 2°, 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 75 R (75 L respectively);
        driving beam: EM and point HV (percentage of EM).

        6.4.4. if the applicant has not indicated more than one mounting position,  the procedure of paragraphs 6.4.1. to 6.4.3. shall be repeated for all 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 test of paragraph 6.4.3. shall be made with the reflector moved into its extreme positions (instead of + 2°) 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 by means of a photo receptor, 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 CIE trichromatic coordinates, the light of the beams shall be in the following boundaries:

        limit towards blue  : x > 0.310
        limit towards yellow  : x < 0.500
        limit towards green  : y < 0.150 + 0.640 x
        limit towards green  : y < 0.440
        limit towards purple  : y > 0.050 + 0.750 x
        limit towards red  : y > 0.382

        8. GAUGING OF DISCOMFORT

        The discomfort caused by the passing beam of headlamps shall be gauged. [14]/

        C. FURTHER ADMINISTRATIVE PROVISIONS

        9. MODIFICATION OF THE HEADLAMP TYPE AND EXTENSION OF APPROVAL

        9.1. Every modification of the headlamp type shall be notified to the Administrative Department which approved the headlamp type. The said department may then either:

        9.1.1. Consider that the modifications made are unlikely to have appreciable adverse effects and that in any event the headlamp still complies with the requirements; or

        9.1.2. Require