Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p111
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 299467–302575

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 by means of a photo-receptor, the effective area of which shall be contained within a square of 65 mm side.

       7. PROVISIONS CONCERNING COLOURED LENSES AND FILTERS

       7.1. Approval may be obtained for headlamps emitting either white or selective-yellow  lights with an uncoloured filament lamp. Expressed in CIE trichromatic coordinates, the corresponding colorimetric characteristics for yellow lenses or filters are as follows: Selective-yellow filter (screen or lens)

        Limit towards red   y>0.138 + 0.58 x

        Limit towards green   y<1.29 x -0.1

        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  757 - 585 nm

        purity factor    0.90 - 0.98

       The transmission factor must be > 0.78

       The transmission factor shall be determined by using a light source with a colour temperature of 2,856 K. [13/]

       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 OF DISCOMFORT

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

       9. STANDARD (REFERENCE) HEADLAMP [15/]

       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 160 mm;

       9.3. provides, with a standard (reference) filament lamp, at the various points 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. above, for a type of headlamp emitting either white light or selective-yellow light, article 3 of the Agreement to which the Regulation is annexed shall not prevent the Contracting Parties from prohibiting headlamps emitting a beam of white or selective-yellow light on vehicles registered by them.

C. FURTHER ADMINISTRATIVE PROVISIONS

       11. MODIFICATION   OF   THE   HEADLAMP TYPE AND EXTENSION OF APPROVAL

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

       11.1.1. 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

       11.1.2. Require a further test report from the technical service