Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p54
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 145507–148526

B 50 L for passing beam (or HV, 50L, B50R for headlamps designed   for left-hand traffic) a complete headlamp sample shall be tested for stability of photometric performance in operation. "Complete headlamps" shall be understood to mean the complete lamp itself including those surrounding body parts and lamps which could influence its thermal dissipation.

       1. TEST OF STABILITY OF PHOTOMETRIC PERFORMANCE

       The tests shall be carried out in a dry and still atmosphere at an ambient temperature of 23 degrees C +/- 50 degreesC, the complete headlamp being mounted on a base representing the correct installation on the vehicle.

       1.1. Clean headlamp

       The headlamp shall be operated for 12 hours as described in subparagraph 1.1.1. and checked as prescribed in subparagraph 1.1.2.

       1.1.1. Test procedure

       The headlamp shall be operated for a period according to the specified time, so that:

          1.1.1.1. (a) in the case where only one lighting function (driving or passing beam) is to be approved, the corresponding filament is lit for the prescribed time, [2/]

          (b) in the case of a reciprocally incorporated passing lamp and driving lamp (dual filament SB headlamp):

           If the applicant declares that the headlamp is to be used with a single filament lit [1/] at a time, the test shall be carried out in accordance with this condition, activating 2/ each specified function successively for half the time specified in paragraph 1.l.;

           In all other cases 1/ 2/ the headlamp, shall be subjected to the following cycle until the time specified is reached:

           15 minutes, passing-beam filament lit

           5 minutes, all filaments lit.

          (c) in the case of grouped lighting functions all the individual functions shall be lit simultaneously for the time specified for individual lighting functions (a) also taking into account the use of reciprocally incorporated lighting functions (b), according to the manufacturer's specifications.

       1.1.1.2. Test voltage

       The voltage shall be adjusted so as to supply a wattage 15% (26% for 24 V types) higher than the rated wattage specified in this Regulation for the type(s) of SB headlamp(s) concerned is (are) obtained.

       1.1.2. Test results

       1.1.2.1. Visual inspection

       Once the headlamp has been stabilized to the ambient temperature, the headlamp lens and the external lens, if any, shall be cleaned with a clean, damp cotton cloth. it shall then be inspected visually; no distortion, deformation, cracking or change in colour of either the headlamp lens or the external lens, if any, shall be noticeable.

       1.1.2.2. Photometric test

       To comply with the requirements of this Regulation, the photometric values shall be verified in the following points:

       Passing beam:

       50R - B50L - HV for headlamps designed for right-hand traffic

       50L - B50R - RV for headlamps designed for left-hand traffic

       Driving