Single lamp definition
Single lamp means a lamp with one lighting or light signalling function, one or more light sources and one illuminating surface which may be continuous or composed of two or more distinct parts or an assembly of two independent lamps having the same function, or two independent retro-reflectors, installed so that the projection of their illuminating surfaces in the direction of the reference axis occupies not less than 60 per cent of the smallest quadrilateral circumscribing these projections. If the surface is composed of more than two distinct parts either the total area of the projections shall occupy not less than 60 per cent of the smallest quadrilateral circumscribing these projections or the distance between two adjacent distinct parts shall not exceed 15 mm.]