Document ID: chunk:federal_register_of_legislation:F2023C00155:body:0:p4
Version: federal_register_of_legislation:F2023C00155
Segment Type: other
Provision Reference: 
Character Range: 10027–12788

screen edges situated in that plane and each allowing only 98% of the total intensity of the lamp to subsist in the direction of the axis of reference; for the purposes of determining the lower, upper and lateral edges of the lamp, only screens having a horizontal or a vertical edge shall be considered;

       2.8. "apparent surface" for a specific direction, means the orthogonal projection of the surface of the light-emitting surface on a plan perpendicular to the direction of observation;

       2.9. "axis of reference" (or "reference axis") means the characteristic axis of the lamp signal determined by the manufacturer of the lamp for use as the direction of reference (H = 0, V = 0 degrees) for angles of field for photometric measurements and for installing the lamp on the vehicle;

       2.10. "centre of reference" means the intersection of the axis of reference with the light emitting surface; it is specified by the manufacturer of the lamp;

       2.11. "angles of geometric visibility" means the angles which determine the minimum solid- angle zone in which the apparent surface of the lamp must be visible; this solid-angle zone is defined by the segments of a sphere whose centre coincides with the centre of reference of the lamp and whose equator is parallel to the carriageway; the segments are determined  from  the  axis  of  reference;  the  horizontal  angles  beta  correspond  to longitude, the vertical angles alpha to latitude; within the angles of geometric visibility there must obstacle to the propagation of light from any part of the apparent surface of the lamp; no account is taken of obstacles existing at the time of approval where required, of the lamp.

       3. APPLICATION FOR APPROVAL

       3.1. The application for approval shall be submitted by the holder of the trade name or mark or by his duly accredited representative.  It shall specify:

       3.1.1. the purpose or purposes for which the device submitted for approval is intended;

       3.1.2. in the case of a front position lamp, whether it is intended to emit white or selective- yellow light;

       3.1.3. in the case of a direction indicator: the category.

       3.2. For each type of device, the application shall be accompanied by:

       3.2.1. drawings, in triplicate, in sufficient detail to permit identification of the type of the device and showing in what geometrical position the device is to be mounted on the vehicle; the direction of observation to be taken as the axis of reference in the tests (horizontal angle H = 0, vertical angle V = 0); and the point to be taken as the centre of reference in the said tests; the drawings shall show the position intended for the approval mark and eventually the additional symbols