Document ID: chunk:federal_register_of_legislation:F2023C00154:front:0:p18
Version: federal_register_of_legislation:F2023C00154
Segment Type: other
Provision Reference: 
Character Range: 46456–49200

Inside the field between lines 1 to 5 in Figure 3 of Annex 4, the beam pattern should be substantially uniform. Discontinuities in intensities detrimental to satisfactory visibility between the lines 6, 7, 8 and 9 are not permitted.
6.4.3.4. In the light-distribution as specified in the table in paragraph 6.4.3. above, single narrow spots or stripes inside the area including the measuring points 1 to 10 and line 1 or inside the area of line 1 and line 2 with not more than 175 cd are allowed, if not extending beyond a conical angle of 2° aperture or a width of 1°. If multiple spots or stripes are present they shall be separated by a minimum angle of 10°.
         6.4.3.5. If the specified luminous intensity requirements are not met, a re-aim of the cut-off position within ±0.5° vertical and/or ±2° horizontal is allowed. In the re-aimed position all photometric requirements shall be met.

6.4.4. Other photometric requirements
6.4.4.1. In the case of front fog lamps equipped with gas-discharge light sources with the ballast not integrated with the light source, the luminous intensity shall exceed 1,080 cd in the measuring point at 0° horizontal and 2° D vertical, four seconds after activation of the fog lamp which has not been operated for 30 minutes or more.
6.4.4.2. To adapt to dense fog or similar conditions of reduced visibility, it is permitted to automatically vary the luminous intensities provided that:
(a) An active electronic light source control gear is incorporated into the front fog lamp function system;
(b) All intensities are varied proportionately.
The system, when checked for compliance according to the provisions of paragraph 6.4.1.1.2. above, is considered acceptable if the luminous intensities remain within 60 per cent and 100 per cent of the values specified in the table in paragraph 6.4.3.
6.4.4.2.1. An indication shall be inserted in the communication form (Annex 1, item 10.).
6.4.4.2.2. The Technical Service responsible for type approval shall verify that the system provides automatic modifications, such that good road illumination is achieved and no discomfort is caused to the driver or to other road users.
6.4.4.2.3. Photometric measurements shall be performed according to the applicant's description.

7. Colour
The colour of the light emitted by the front fog lamp shall be either white or selective yellow by choice of the applicant. The selective yellow colour, if any, of the beam may be obtained either by the colour of the light source or by the lens of the front fog lamp or by any other suitable means.
7.1. The colorimetric characteristics of the front fog lamp shall be measured with voltages as defined in paragraphs 6.3. and 6.4. of this Regulation.

8. Determination of