Document ID: chunk:federal_register_of_legislation:F2023C00142:reg:21:p10
Version: federal_register_of_legislation:F2023C00142
Segment Type: reg
Provision Reference: reg 21 (pt 10/15)
Character Range: 58888–61684

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 carried out in a dry and still atmosphere at an ambient temperature of 23 degrees C +/- 5 degrees C.
         Using a mass production gas-discharge light source which has been aged for at least 15 hours, the headlamp shall be operated on passing beam function 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 1.1.1.2.). 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 results.
         2.2. Test results
         2.2.1. The result expressed in milliradians (mrad) shall be considered as acceptable for a passing beam headlamp when the absolute value deltar1=|r3 - r60|recorded on the headlamp is not more than 1. 0 mrad (deltarI < 1.0 mrad) .
         2.2.2. However, if this value is more than 1.0 mrad but not more than 1.5 mrad (1. 0 mrad < deltarI < 1.5 mrad) , a second headlamp shall be tested as described in paragraph 2.1., after being subjected three consecutive times to the cycle as described below, in order  to stabilize the position of mechanical parts of the headlamp on a base representative of the correct installation on the vehicle:
         5/50 V is situated 375 mm below HV on the vertical line VV on the screen at 25 m distance.
         operation of the passing beam for one hour (the voltage shall be adjusted as specified in paragraph 1.1.1.2.);
         Period of rest for one hour.
         The headlamp type shall be considered as acceptable if the mean value of the absolute values deltarI, measured on the first sample and deltarII measured on the second sample is not more than 1.0 mrad.

Annex 5

REQUIREMENTS FOR LAMPS INCORPORATING LENSES OF PLASTIC MATERIAL - TESTING OF LENS OR MATERIAL SAMPLES AND OF COMPLETE LAMPS

         1.              GENERAL SPECIFICATIONS
         1.1. The samples supplied pursuant to paragraph 2.2.4. of the Regulation shall satisfy the specifications indicated in paragraphs 2.1. to 2.5. below.
         1.2. The two samples of complete lamps supplied pursuant to paragraph 2.2.3. of the Regulation and incorporating lenses of plastic material shall, with regard to the lens