Document ID: chunk:federal_register_of_legislation:F2023C00158:front:0:p13
Version: federal_register_of_legislation:F2023C00158
Segment Type: other
Provision Reference: 
Character Range: 33805–36900

to illuminate the retro-reflecting device must not undergo a change of more than 0.01 after reflection by the retro-reflecting device.

       3.1. This shall be verified by the visual comparison test indicated above, the control field being illuminated by a light source of which the trichromatic coordinates differ by 0.01 from that of standard illuminant A.

       3.2. In case of doubt, the trichromatic coordinates for the most selective sample shall be determined.

       Annex 7

       PHOTOMETRIC SPECIFICATIONS

       1. When applying for approval, the applicant shall specify the axis of reference. This corresponds to the illumination angle V = H = 0 degrees in the table of coefficients of luminous intensity (CIL).

       2. For photometric measurements only the illuminating surface contained within a circle of 200mm diameter for Class IA or IB shall be considered, and the illuminating surface itself shall be limited to 100cm2 though the surfaces of the retro-reflecting optical units need not necessarily attain this area. The manufacturer shall specify the perimeter of the area to be used. In the case of Class III A and IV A the whole of the illuminating surfaces shall be considered without limitation as to size.

       3. CIL values

       3.1. Class IA, Class IB and Class IIIA

       3.1.1. The CIL values for red retro-reflecting devices must be at least equal to those in the table below, expressed in millicandelas per lux, for the angles of divergence and illumination shown.

Class         Class Divergence Alpha  Illumination angles (in degrees)
Vertical V    0 degrees               ± 10 degree                       ± 5 degree
Horizontal H  0 degrees               0 degree                          ± 20 degrees
I A, I B      20'                                                       300           200  100
              1 degree 30'                                              5             2.8  2.5
III A         20'                                                       450           200  150
              1 degree 30'                                              12            8    8

       CIL values lower than those shown in the last two columns of the above table are not permissible within the solid angle having the reference centre as its apex and bounded by the planes intersecting along the following lines:

       (V = +/- 10 degrees, H = 0 degrees)

       (V = +/- 5 degrees, H = +/- 20 degrees).

       3.1.2. CIL values for amber retro-reflecting devices in class IA or IB must be at least equal to those in the table of paragraph 3.1.1. above multiplied by the coefficient 2.5;

       3.1.3. CIL values for colourless retro-reflecting devices in class IA or IB must be at least equal to those in the table of paragraph 3.1.1. above multiplied by the coefficient 4.

       3.2. For devices of Class IV A the CIL values must be at least equal to those in the table below, expressed in millicandelas per lux, for the angles of divergence and illumination shown.

Colour        Angle of Divergence Alpha  Illumination angles (in