Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p78
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 210177–213254

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 referred to in paragraphs 6.2.5. to 6.2.7. and 6.3. above shall be measured by means of a photoreceptor, the effective area of which shall be contained within a square of 65mm side.

       7. REQUIREMENTS CONCERNING COLOURED LENSES AND FILTERS

       7.1. Approval may be obtained for headlamps emitting either white or selective-yellow light with a filament lamp. Expressed in CIE thrichromatic coordinates, the corresponding colorimetric characteristics are as follows:

       Selective-yellow filter (screen or lens)

       Limit towards red  y >0.138 + 0.580 x

       Limit towards green  y<1.29 x - 0.100

       Limit towards white  y>-x + 0.966

       Limit towards

       spectral value   y<-x + 0.992

       which can also be expressed as follows:

       dominant wave-length: 575-585nm

       purity factor:   0.90- 0.98

       The transmission factor must be>0.78 when determined by means of a source of light with a colour temperature of 2,856K.[15/]

       7.2. The filter must be part of the headlamp, and must be attached to it in such a way that the user cannot remove it either inadvertently or, with ordinary tools, intentionally.

       8. GAUGING DISCOMFORT

        The discomfort caused by the passing beam of headlamps shall be gauged.[16/]

       9. STANDARD HEADLAMP [17/]

        A headlamp shall be deemed to be a standard (reference) headlamp if it:

       9.1. satisfies the above-mentioned requirements for approval;

       9.2. has an effective diameter of not less than 160mm;

       9.3. provides with a standard filament lamp, at the various point and in the various zones referred to in paragraph 6.2.5., illumination equal to:

       9.3.1. not more than 90% of the maximum limits and

       9.3.2. not less than 120% of the minimum limits prescribed in the table in paragraph 6.2.5.

       10. OBSERVATION CONCERNING COLOUR

       Since any approval under this Regulation is granted, pursuant to paragraph 7.1.