Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p45
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 121098–124139

need meet only the requirements referred to in paragraph 8.9.

       8.8. The illumination produced on the screen by the passing beam shall meet the following requirements:

       Table 2

Point on measuring screen        Required illumination in lux
SB units for right-hand traffic  SB units for left-hand traffic  Minimum  Maximum
B 50 L                           B 50 R                          -        0.3
75 R                             75 L                            6        -
50 R                             50 L                            6        -
25 L                             25 R                            1.5      -
25 R                             25 L                            1.5      -
Every point in Zone III          -                               0.7
"        "     "     "    IV     2                               -
"        "     "     "    I      -                               20

       8.8.1. There shall be no lateral variations detrimental to good visibility in any of the zones, I, II, III and IV;

       8.8.2. SB units designed to meet the requirements of both right-hand and left-hand traffic must, in each of the two setting positions, meet the requirements set forth above for the corresponding direction of traffic.

       8.9. In the case of an SB unit designed to provide a driving beam and a passing beam, measurements of the illumination produced on the screen by the driving beam shall be taken with the same unit alignment and voltage as for measurements under paragraph 8.8 above.

       8.10. The illumination produced on the screen by the driving beam shall meet the following requirements:

       8.10.1. The point of intersection HV of the line hh and vv shall be situated within the isolux 90% of maximum illumination.  The maximum value shall not be less than 32 lux;

       8.10.2. Starting from point HV, horizontally to the right and left, illumination shall be not less than 16 lux up to a distance of 1.125 metres, and not less than 4 lux up to a distance of 2.25 metres.

       8.11. The screen illumination values mentioned in paragraphs 8.8 and 8.9 above shall be measured by means of a photoelectric cell, the effective area of which shall be contained within a square of 65 mm side.

       9.  COLOUR

       The light emitted shall be white or selective yellow.  In the latter case the dominant wavelength must be between 5,750 and 5,850 Angstrom units, the purity factor shall be between 0.90 and 0.98 and the illumination produced on the screen by the passing beam must meet the requirements of Table 2 with all the figures multiplied by a factor of 0.84.[11/]

       10. REMARK CONCERNING COLOUR

       Any approval under this Regulation which is granted by virtue of paragraph 9 above for a type of SB unit emitting white light or selective yellow light, does not prevent the Contracting Parties from prohibiting, on the vehicles which they register, SB units emitting-either white or selective yellow light, according to article 3 of the Agreement to