Document ID: chunk:federal_register_of_legislation:F2023C00228:reg:1:p14
Version: federal_register_of_legislation:F2023C00228
Segment Type: reg
Provision Reference: reg 1 (pt 14/15)
Character Range: 571782–574548

as possible with reference to line V-V;

       6.2.2.2. For vertical adjustment:  The horizontal part of the "cut-off" line is adjusted to its nominal position 1 per cent below the H-H-line which is 10 cm below the headlamp axis on the screen at 10 m distance or which is 25 cm below the headlamp axis on the screen at 25 m distance.

       If, however, vertical adjustment cannot be performed repeatedly to the required position within the allowed tolerances, the instrumental method of Annex 9, paragraphs 4. and 5. shall be applied to test compliance with the required minimum quality of the "cut-off" line and to perform the beam vertical adjustment.

       6.2.3. When so aimed, the headlamp need, if its approval is sought solely for provision of a passing beam, [34]/ comply only with the requirements set out in paragraphs 6.2.5. to 6.2.6. below; if it is intended to provide both a passing beam and a driving beam, it shall comply with the requirements set out in paragraphs 6.2.5., 6.2.6. and 6.3.

       6.2.4. Where a headlamp so aimed does not meet the requirements set out in paragraphs 6.2.5., 6.2.6. and 6.3., its alignment may be changed, except for headlamps that have no mechanism to adjust horizontal aim, on condition that the axis of the beam is not displaced laterally by more than 1 degree (= 44 cm) to the right or left [35]/.  To facilitate alignment by means of the "cut-off", the headlamp may be partially occulted in order to sharpen the "cut-off".  However, the "cut-off" should not extend beyond the line H-H.

       6.2.5. The illumination produced by the passing beam on the screens in Annex 3 shall meet the following illumination requirements:

       6.2.5.1. For Class A headlamps:

       Any point on and above the line H-H           0.32 lux
       Any point on line 25L-25R                     1.28 lux
       Any point on line 12.5L-12.5R                 0.64 lux

       6.2.5.2. For Class B headlamps:

Any point on and above the line H-H         0.7 lux
Any point on line 50L-50R except 50V */     1.5 lux
Point 50V                                   3 lux
Any point on line 25L-25R                   3 lux
Any point in zone IV                        1.5 lux

*/ ratio of intensities

       6.2.5.3. For Class C or D headlamp:
TEST               Position in B- Grid in angular degrees
POINT/ LINE/ ZONE  Vertical **                                              Required illumination in lux at 25 m
                   Horizontal B**
Minimum            Maximum
Class D            Class C                                                   Class D                               Class C
> 125cc             125cc                                                   > 125cc                                125cc