This specific identification code shall be comprised of starting letters "ALU" for "Additional Lighting Unit" followed by approval marking without the circle and in the case where several non-identical additional lighting units are used, additional symbols or characters shall follow. This specific identification code shall be shown in the drawings. The approval marking does not have to be the same as the one on the lamp in which the additional lighting unit(s) is used, but both markings shall be from the same applicant. a0c0