Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p13
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 36353–39126

Paragraphs 6.3 and 6.4, its adjustment may be changed, provided that the axis of the beam or the point of intersection HV specified Annex 6 to this Regulation is not laterally displaced by more than 1 degrees (= 44 cm) to the right or left[10/].  To facilitate adjustment by    means of the "cut-off", the headlamp may be partially occulted in order to sharpen the "cut-off".

       If the headlamp is designed solely to provide a driving beam, it shall be so adjusted that the area of maximum illumination is centred on the point of intersection of the lines hh and vv.  Such a headlamp need meet only the requirements referred to in Paragraph 6.5.

       If, in the case of a headlamp designed to satisfy the requirements of this Regulation with respect to the passing beam only, the focal axis diverges appreciably from the general direction of the beam, lateral adjustment shall be effected to the manner which best satisfies the requirements for illumination at points 75 and 50.

       The limit of non-adjustment of 1? to the right or left is not incompatible with vertical non-adjustment.  The latter is limited only by the requirements of Paragraph 6.4.

       6.3. The illumination produced on the screen by  the passing beam shall meet the requirements of the following Table[11/]:

Point on measuring screen         Required

Headlamps for right-hand traffic  Headlamps for left-hand traffic  Illumination in lux

Point B 50 L                      Point B 50 R                     < 0.4

Point B 75 R                      Point B 75 L                     > 6 >

Point B 50 R                      Point B 50 L                     6

Point B 25 L                      Point B 25 R                     > 1.5

Point B 25 R                      Point B 25 L                     > 1.5

Any point in zone III             < 0.7

Any point in zone IV              > 2

Any point in zone I               < 20

       It is understood that, where the flux of the standard filament lamp used for measurement is other than 450 lumens, the measurements as taken will be corrected proportionally to the rates of the fluxes.  There shall be no lateral variations detrimental to good visibility in any of the zones, I, II, III and IV.

       Headlamps designed to meet the requirements of both right-hand and left-hand traffic must, in each of the two setting positions of the optical unit or of the filament lamp, meet the requirements set forth above for the corresponding traffic system.

       6.4. The illumination values in zones "A" and "B" [*/] as shown in Figure PIC in Annex 6 shall be checked by the measurement of the photometric values of points 1 to 8 on this Figure; these values shall lie within the following limits:

       1 + 2 + 3 > 0.3 lux, and 4 +