Document ID: chunk:federal_register_of_legislation:F2023C00154:front:0:p14
Version: federal_register_of_legislation:F2023C00154
Segment Type: other
Provision Reference: 
Character Range: 33970–37584

specified by the manufacturer, which may be supplied by the manufacturer or applicant, shall be used.
6.3.1.1. During the testing of the front fog lamp the power supply for this filament lamp shall be regulated so as to obtain the reference luminous flux at 13.2 V as indicated in the relevant data sheet of Regulation No. 37.
6.3.1.2. During the testing of a front fog lamp where the filament lamp cannot be replaced, the voltage at the terminals of the front fog lamp shall be regulated at 13.2 V.
6.3.2. The front fog lamp shall be deemed satisfactory if the photometric requirements are met with at least one standard filament lamp.
6.3.3. The aiming screen for visual adjustment (see Annex 4 to this Regulation) shall be positioned at either a distance of 10 m or a distance of 25 m in front of the front fog lamp.
6.3.3.1. The beam shall produce on this aiming screen, over a width of not less than 5.0° on both sides of the line v, a symmetrical and substantially horizontal cut-off to enable visual vertical adjustment.
6.3.3.2. The front fog lamp shall be so adjusted that the cut-off on the aiming-screen is 1.15° below the line h.
6.3.4. When so adjusted, the front fog lamp shall meet the requirements in paragraph 6.3.5. below.
6.3.5. The illumination (see Annex 4, paragraph 2.1.) shall meet the following requirements:
Designated lines or zones                                                                   Vertical position*       Horizontal position*  Luminous intensity  To comply
Line 1                                                                                            15° U to 60° U     0°                    145 cd max          All line

Zone A                                                                                            0° to 1.75° U      5° L to 5°R           85 cd min           Whole zone

Zone B                                                                                            0° to 3.5° U       26°L to 26°R          570 cd max          Whole zone

Zone C                                                                                            3.5° U to 15° U    26°L to 26°R          360 cd max          Whole zone

Zone D                                                                                            1.75° D to 3.5° D  12°L to 12°R          1,700 cd min        At least one point on each vertical line
                                                                                                                                           11,500 cd max
                                                                                                  1.75° D to 3.5° D  12°L to 22°L          810 cd min
Zone E                                                                                                               and                                       At least one point on each vertical line
                                                                                                                     12°R to 22°R          11,500 cd max
* The co-ordinates are specified in degrees for an angular web with a vertical polar axis.

The luminous intensity shall be measured in either white or selective yellow light as prescribed by the manufacturer for use of the front fog lamp in normal service.
Variations detrimental to satisfactory visibility in either of the Zones B and C are not permitted.
6.3.6. In the light-distribution as specified in the table in paragraph 6.3.5. above, single narrow spots or stripes inside the area above 15° with not more than 230 cd are allowed, if not extending beyond a conical