Document ID: chunk:federal_register_of_legislation:F2023C00162:body:0:p4
Version: federal_register_of_legislation:F2023C00162
Segment Type: other
Provision Reference: 
Character Range: 10006–12992

"E" followed by the distinguishing number of the country which has granted approval;[5/].

       5.4.1.2. an approval number.

       5.5. The markings according to paragraph 5.4. shall be clearly legible and indelible.

       5.6. Annex 2 to this Regulation gives an example of the arrangement of the approval mark.

       6. GENERAL SPECIFICATIONS

       6.1. Each device shall conform to the specifications of paragraph 7. of this Regulation.

       6.2. Headlamps shall be so designed and constructed that, in normal use, despite the vibrations to which they may be subjected, their satisfactory operation continues to be ensured and they retain the characteristics prescribed by this Regulation.

       6.3. The parts intended for holding the filament lamp in the reflector shall be so made that, even in darkness, the filament lamp can be mounted in no other position than the correct one.

       7. SPECIAL SPECIFICATIONS

       7.1. The correct position of the lens in relation to the optical system shall be unequivocally marked and be locked against rotation in service.

       7.2. For the measurement of the illumination produced by the headlamp, a measuring screen as described in annex 3 of this Regulation and a standard filament lamp with a smooth and colourless bulb according to the category S3 of Regulation No. 37 shall be used.

       The standard filament lamp shall be adjusted to the applicable reference luminous flux according to values prescribed for these lamps in Regulation No. 37.

       7.3. The beam shall have a cut-off sufficiently sharp in order that satisfactory aiming can practically be achieved with its aid. The cut-off shall be substantially horizontal and as straight as possible over a horizontal length of at least +/- 900 mm measured at a distance of 10 m.

       When aimed according to annex 3, the headlamps shall meet the requirements specified in it.

       7.4. The beam pattern shall not present any lateral variations detrimental to good visibility.

       7.5. The illumination on the screen mentioned in paragraph 7.2. above shall be measured by means of a photo-receptor having a useful area comprised within a square of 65 mm side.

       8. PROVISIONS CONCERNING COLOURED LENSES AND FILTERS

       8.1. Approval may be obtained for headlamps emitting either colourless or selective-yellow lights with an uncoloured lamp. Expressed in CIE trichromatic co-ordinates, the corresponding colorimetric characteristics for yellow glasses or filters are as follows:

       Selective-yellow filter (screen or lens)

       Limit towards red   y ≥ 0.138 + 0.58 x

       Limit towards green  y ≤ 1.29 x -0.1

       Limit towards white   y ≤ - x + 0.966

       Limit towards spectral value  y ≤- x + 0.992

       which can also be expressed as follows:

       dominant wave-length  575 - 585 n m

       purity factor   0.90 - 0.98

       The transmission factor must be  ≥ 0.78

       The transmission factor shall