Document ID: chunk:federal_register_of_legislation:F2023C00228:reg:1:p23
Version: federal_register_of_legislation:F2023C00228
Segment Type: reg
Provision Reference: reg 1 (pt 23/40)
Character Range: 398505–401149

in conformity with those shown in one of the patterns reproduced in annex 3 to this Regulation and shall be of the dimensions specified in that annex.

       6.5. Complementary tests shall be done according to the requirements of annex 6 to ensure that in use there is no excessive change in photometric performance.

       6.6. If the lens of the HSB unit is of plastic material, tests shall be done according to the requirements of annex 7.

       7. RATED AND TEST VALUES

       7.1. The rated voltage is 12 volts. [4/]

       7.2. The wattage shall not exceed 75 watts on the driving beam filament and 68 watts on the passing beam filament measured at a test voltage of 13.2 volts.

       8. ILLUMINATION [5/]

       8.1. General specifications

       8.1.1. HSB units shall be made so as to give adequate illumination without dazzle when emitting the passing beam and good illumination when emitting the driving beam.

       8.1.2. The illumination produced by the HSB unit shall be determined by means of a vertical screen set up 25 m forward of the unit as shown in annex 4 to this Regulation. [6/]

       8.1.3. On this screen, the illumination referred to in paragraphs 8.2.5., 8.2.6. and 8.3. below shall be measured by means of a photoreceptor, the effective area of which shall be contained within a square of 65 mm side.

       8.2. Requirements concerning the passing beam

       8.2.1. The passing beam shall produce a "cut-off" I sharp enough to serve as a satisfactory means of adjustment.  The "cut-off" shall be a horizontal straight line on the side opposite to the direction of the traffic for which the unit is intended. on the other side it shall not extend beyond either the broken line HV H1 H4 formed by a straight line HV    H1 making a 45 degrees angle with the horizontal and a straight line H1 H4, 25 cm above the straight line hh, or the straight line HV H3, inclined at an angle of 15 degrees above the horizontal (see annex 4 to this Regulation).  A "cut-off" extending beyond both line HV H2 and line H2 H4 and resulting from a combination of the above two possibilities shall in no circumstances be permitted.

       8.2.2. The HSB unit shall be so aimed that on the passing beam:

       8.2.2.1. in the case of HSB units 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 HSB units designed to meet the requirements of left-hand traffic, the "cut-off" on the right half of the screen is horizontal;

       8.2.2.2. this horizontal part of the "cut-off" is situated on the screen 25 cm below the level hh