Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p21
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 57436–60300

OPERATION TEST ON COMPLETE HEADLAMPS

Once the photometric values have been measured according to the prescriptions of this Regulation, in points for Emax for driving beam and HV, 50 R, B 50 L for passing beam (or HV, 50 L, B 50 R for headlamps designed for left-hand traffic) a complete headlamp sample shall be tested for stability of photometric performance in operation.  "Complete headlamp" shall be understood to mean the complete lamp itself including those surrounding body parts and lamps which could influence its thermal dissipation.

       1. TEST FOR STABILITY OF PHOTOMETRIC PERFORMANCE

       The tests shall be carried out in a dry and still atmosphere at an ambient temperature of 23 degrees C +/- 5 degrees C, 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 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, 1/

           (b) In the case of a reciprocally incorporated passing lamp and driving lamp (dual filament lamp or two filament lamps):

           If the applicant declares that the headlamp is to be used with a single filament lit [2/] at a time, the test shall be carried out in accordance with this condition, activating [1/] each specified function successively for half the time specified in Paragraph 1.1,

           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% higher than the rated wattage specified in the Regulation for filament lamps (Regulation No. 37) at a rated voltage of     6 V or 12 V, and 26% higher than the rated wattage for 24 V filament lamps.

       The applied wattage shall in all cases comply with the corresponding value of a filament lamp of 12 V rated voltage, except if the applicant for approval specifies that the headlamp may be used at a different voltage.  In the latter case, the test shall be carried out with the filament lamp whose wattage is the highest that can be used.

       1.1.2.