6.3.3.1. Throughout the fields defined in the diagrams in Annex 1, the intensity of the light emitted shall be not less than 0.7 cd for devices of category 1b, not less than 0.3 cd for devices of categories 1, 1a, 2a and for those of category 2b by day; it shall not be less than 0.07 cd for devices of category 2b by night; a0c0