Document ID: chunk:federal_register_of_legislation:F2023C00142:reg:21:p9
Version: federal_register_of_legislation:F2023C00142
Segment Type: reg
Provision Reference: reg 21 (pt 9/15)
Character Range: 56287–59146

1.1.1., after being prepared as prescribed in subparagraph 1.2.1., and checked as prescribed in subparagraph 1.1.2.
         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 parts 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 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 illuminating value has dropped to 15-20 % of the values measured for each following point under the conditions described in this annex:
         Point Emax in passing beam/driving beam and in driving beam 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.  The gas-discharge light source supplied by the applicant shall be used for the photometric verification.

         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. shall be subjected to the test described in paragraph 2.1., without being removed from or readjusted in relation to its test fixture.
         If the headlamp has a moving reflector, only the position closest to the average vertical angular stroke is chosen for this test.
         2.1. Test for passing beam headlamps
         The test shall be