Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p106
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 286598–289367

Regulation gives examples of arrangements of approval marks relating to the above case.

       B. TECHNICAL REQUIREMENTS FOR HEADLAMPS [6/]

       5. GENERAL SPECIFICATIONS

       5.1. Each sample shall conform to the specifications set forth in paragraph 6. to 8. below.

       5.2. Headlamps shall be so made as to retain their prescribed photometric characteristics and to remain in good working order when in normal use, in spite of the vibrations to which they may be subjected.

       5.2.1. Headlamps shall be fitted with a device enabling them to be so adjusted on the vehicles  as to comply with the rules applicable to them. Such a device need not be fitted on units  in which the reflector and the diffusing lens cannot be separated, provided the use of   such units is confined to vehicles on which the headlamp setting can be adjusted by other means.

       Where a headlamp providing a passing beam and a headlamp providing a driving beam, each equipped with its own filament lamp, are assembled to form a composite unit the adjusting device shall enable each optical system individually to be duly adjusted.

       5.2.2. However, these provisions shall not apply to headlamp assemblies whose reflectors are indivisible.  For  this  type  of  assembly  the  requirements  of  paragraph  6.3.  of  this Regulation shall apply.

       5.3. The components by which the filament lamp is fixed to the reflector shall be so made that, even in darkness, the filament lap can be fixed in no position but the correct one. [7/] The filament lamp holder shall conform to the characteristics given on data sheet 7005- 39-1 of IEC Publication 61-2, third edition, 1969.

       5.4. Headlamps designed to satisfy the requirements both of right-hand and of left-hand traffic may be adapted for traffic on a given side of the road either by an appropriate initial setting when fitted on the vehicle or by selective setting by the user. Such initial or selective setting may consist, for example, of fixing either the optical unit at a given angle on the vehicle or the filament lamp at a given angle in relation to the optical unit. In all cases, only two different and clearly distinct settings, one for right-hand and one for left-hand traffic, shall be possible, and the design shall preclude inadvertent shifting from one setting to the other or setting in an intermediate position. Where two different setting positions are provided for the filament lamp, the components for attaching the filament lamp to the reflector must be so designed and made that, in each of its two settings, the filament lamp will be held in position with the precision required for headlamps designed for traffic on only one side of the road. Conformity with the requirements  of