Document ID: chunk:federal_register_of_legislation:F2023C00142:front:0:p10
Version: federal_register_of_legislation:F2023C00142
Segment Type: other
Provision Reference: 
Character Range: 26678–29519

axes (see paragraph 6.2.6. and annex 3 to this Regulation), or by any equivalent photometric method.

       6.1.3. The headlamp using a removable gas-discharge light source shall be deemed satisfactory if the photometric requirements set in the present paragraph 6. are met with one standard light source, which has been aged during at least 15 cycles, in accordance with annex 4, paragraph 4 of Regulation No. 99. The flux of this gas-discharge light source may differ from the objective luminous flux specified in Regulation No. 99.  In this case, the illuminances shall be corrected accordingly.

       This correction does not apply to headlamps using non removable gas-discharge light source, or to headlamps with the ballast(s) totally or partially integrated.

       6.1.4. The dimensions determining the position of the arc inside the standard gas-discharge light source are shown in the relevant data sheet of Regulation No. 99.

       6.1.5. Photometric compliance must be checked in accordance with paragraph 6.2.6. or 6.3. of this Regulation.  This is also valid for the cutoff zone between 3 degrees R and 3 degrees L (measurement method for the cut-off colour being under consideration).

       6.1.6. The trichromatic coordinates of the light of the beams emitted by headlamps using gas- discharge light sources must be in the following boundaries:

Limit towards  blue    x > 0.310

               yellow  x > 0.310

               green   y < 0.150 + 0.640x

               green   y < 0.440

               purple  y > 0.050 + 0.750x

               red     y > 0.382

       6.1.7. Four seconds after ignition of a headlamp which has not been operated for 30 minutes or more, 60 lux at least must be reached at point HV of a driving beam and 10 lux at point 50V of a passing beam for headlamps incorporating driving beam and passing beam functions, or 10 lux at point 50V for headlamps having only a passing beam function.  The power supply shall be sufficient to secure the quick rise of the high current pulse.

       6.2. Provisions concerning passing beams

       6.2.1. The passing beam must produce a sufficiently sharp "cut-off" to permit a satisfactory adjustment with its aid.  The "cut-off" must be a horizontal straight line on the side opposite to the direction of traffic for which the headlamp is intended; on the other side it must not extend either above the line HV/H2 of annex 3, Screen 1, or above the line HV/H3/H4 of annex 3, Screen 2. A cut-off extending above a combination of these lines shall in no circumstances be permitted.

       6.2.2. The headlamp shall be so aimed that:

       6.2.2.1. in the case of headlamps designed to meet the requirements of right-hand traffic, the "cut-off" on the left-half of the screen [9/] is horizontal and, in the case of headlamps designed to meet