Document ID: chunk:federal_register_of_legislation:F2023C00154:front:0:p32
Version: federal_register_of_legislation:F2023C00154
Segment Type: other
Provision Reference: 
Character Range: 83493–86000

than 14 days old.
1.2.1.2. Application of the test mixture to the front fog lamp
The test mixture shall be uniformly applied to the entire light emitting surface of the front fog lamp and then left to dry. This procedure shall be repeated until the illumination value has dropped to 15-20 per cent of the values measured for the following point under the conditions described in this annex:
Point of Emax in zone D.
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 the specified value for an operating front fog lamp.
The front fog lamp tested in accordance with paragraph 1. of this annex, shall be subjected to the test described in paragraph 2.1. below, 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 °C ± 5 °C.
Using a mass production light source, which has been aged for at least one hour, the front fog lamp shall be operated 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 paragraph 1.1.2. above). The position of the cut-off line between a point situated 3.0 degrees left and a point situated 3.0 degrees right of the line VV (see Annex 4 to the Regulation) shall be verified after three minutes (r3) and 60 minutes (r60) respectively of 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 results.
2.2. Test results
2.2.1. The result expressed in milliradians (mrad) shall be considered acceptable when the absolute value ∆ rI = | r3 - r60 | recorded on this front fog lamp is not more than 2 mrad (∆ rI ≤ 2 mrad).
2.2.2. However, if this value is more than 2 mrad but not more than 3 mrad (2 mrad < ∆rI ≤ 3 mrad) a second front fog lamp shall be tested as described in paragraph 2.1. above This shall be done after the front fog lamp has been subjected to three consecutive cycles as described below, in order to stabilise the position of the mechanical parts of the front fog lamp that is mounted on a base representative of the correct installation on the vehicle:
(a) Operation of the front fog lamp for one hour. (The voltage shall be adjusted as specified in paragraph 1.1.2. of