| 4.2.1.2. | For testing the colour of the retro-reflective device, this device shall be illuminated by the CIE Standard Illuminant A, with an angle of divergence of 1/3 degrees and an illumination angle of V = H = 0 degree, or, if this produces a colourless surface reflection, an angle V = +/- 5 degrees, H = 0 degree, the trichromatic coordinates of the reflected luminous flux must be within the limits according to the specifications for the individual retroreflecting device in paragraph 4. | a0c0 |