Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p12
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 33656–36571

angles to its axis (see annex 6).

       6.1.2. The headlamp shall be checked by means of (a) standard (etalon) filament lamp(s) designed for a rated voltage of 12 V, any selective-yellow filters [6/] being replaced by geometrically identical uncoloured filters with a transmission factor of at least 80%. During the checking of the headlamp the voltage at the terminals of the filament lamp shall be regulated so as to obtain the following characteristics:

Filament lamp  Approximate supply           Light flux (in lumens)

category       voltage (V) for measurement  driving beam filament   passing beam filament

R2             12                           700                     450

HS1            12                           700                     450

       6.1.3. The dimensions determining the position of the filament(s) and the shield inside the standard filament lamp are shown on the relevant data sheet of Regulation No. 37.

       6.1.4. The bulb of the standard filament lamp shall be of such optical shape and quality that it does not cause any reflection or refraction adversely affecting the light distribution. Compliance with this requirement shall be checked by measuring the light distribution obtained when a standard headlamp is fitted with the standard (etalon) filament lamp.

       6.2. The passing beam must produce a sufficiently sharp "cut-off" to permit satisfactory adjustment with its aid.  The "cut-off" must be a horizontal straight line on the side opposite to the direction of the traffic for which the headlamp is intended; on the other side it should be horizontal or within an angle of 15 degrees  above the horizontal.   The headlamp shall be so adjusted that:

       6.2.1. In the case of headlamps designed to meet the requirements of right-hand traffic, the "cut-off" on the left half of the screen[7/] is horizontal and, in the case of headlamps designed to meet the requirements of left-hand traffic, the "cut-off" on the right half of the screen is horizontal;

       6.2.2. This horizontal part of the "cut-off" is situated on the screen 25 cm below the outline of the horizontal plane passing through the focus of the headlamp (See Annex 6 to this Regulation);

       6.2.3. The screen is in the position indicated in Annex 6[8/].

       When so adjusted, the headlamp shall, if it is intended to provide a passing beam and a driving beam, comply with the requirements referred to in Paragraphs 6.3 and 6.4 below. If it is intended primarily to provide a passing beam, it need comply only with the requirements referred to in Paragraph 6.3[9/].

       Where a headlamp so adjusted does not meet the requirements referred to in Paragraphs 6.3 and 6.4, its adjustment may be changed, provided that the axis of the beam or the point of intersection HV specified Annex 6 to this Regulation is not laterally displaced by more than 1 degrees (= 44 cm)