Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p55
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 148247–151135

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 beam:

       Point of Emax

       Another aiming may be carried out to allow for any deformation of the headlamp base due to heat (the change of the position of the cut-off line is covered in para. 2 of this annex);

       a 10% discrepancy between the photometric characteristics and the values measured prior to the test is permissible including the tolerances of the photometric procedure.

       1.2. Dirty headlamp

       After being tested as specified in subparagraph 1.1. above, the headlamp shall be operated for one hour as described in subparagraph 1.1.1., after being prepared as prescribed in subparagraph 1.2.1., and checked as prescribed in subparagraph.

       1.2.1. Preparation of the headlamp

       1.2.1.1. Test mixture

       1.2.1.1.1 For headlamp with the outside lens in glass:

       The mixture of water and a 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/], and

       an appropriate quantity of distilled water, with a conductivity of < 1 mS/m. The mixture must not be more than 14 days old.

       1.2.1.1.2 For headlamp 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 NaCMC3/,

       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 I 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,

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

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

       1.2.1.3. Measuring equipment

       The