Document ID: chunk:federal_register_of_legislation:F2023C00228:reg:1:p35
Version: federal_register_of_legislation:F2023C00228
Segment Type: reg
Provision Reference: reg 1 (pt 35/40)
Character Range: 430508–433267

1.2.1.1.2. For head lamp with outside lens in plastic material:

       The mixture of water and polluting agent to be applied to the headlamp shall be composed of:

       9 parts by weight of silica sand with a particle size of 0-100 mu m,

       1 part by weight of vegetal carbon dust (beechwood) with a particle size of 0-100 mu m, 0.2 part by weight of NaCMC 3/ ,

       13 parts by weight of distilled water with a conductivity of < 1 mS/m, and

       2 + 1 parts by weight of surface-actant.[4/]

       The mixture must not be more than 14 days old.

       1.2.1.2. Application of the test mixture to the headlamp

       The test mixture shall be uniformly applied to the entire light emitting surface of the headlamp and then left to dry.  This procedure shall be repeated until the illumination value has dropped to 15-20% of the values measured for each following point under the conditions described in paragraph 1 above:

       Point of Emax in driving beam, photometric distribution for a driving/passing lamp,

       Point of Emax in driving beam, photometric distribution for a driving lamp only,

       50 R and 50 V [5/] for a passing lamp only, designed for right-hand traffic,

       50 L and 50 V 5/ for a passing lamp only, designed for left-hand traffic.

       1.2.1.3. Measuring equipment

        The measuring equipment shall be equivalent to that used during headlamp approval tests.

       2. TEST FOR CHANGE IN VERTICAL POSITION OF THE CUT-OFF LINE UNDER THE INFLUENCE OF HEAT

       This test consists of verifying that the vertical drift of the cut-off line under the influence of heat does not exceed a specified value for an operating passing lamp.

       The headlamp tested in accordance with paragraph 1.1., shall be subjected to the test described in 2.1., without being removed from or readjusted in relation to its test fixture.

       2.1. Test

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

       Using a mass production HSB headlamp which has been aged for at least one hour the headlamp shall be operated on passing beam without being dismounted from  or readjusted in relation to its test fixture. (For the purpose of this test, the voltage shall be adjusted as specified in para. 1.1.1.2.). The position of the cut-off line in its horizontal part (between vv and the vertical line passing through point B 50 L for right-hand traffic or B 50 R for left-hand traffic) shall be verified 3 minutes (r3) and 60 minutes (r60) respectively after operation.

       The measurement of the variation in the cut-off line position as described above shall be carried out by any method giving acceptable accuracy and reproducible