Printed circuit (4) comprising a substrate (1) with a first side (11) suitable for the application of the network of connections (43) and the assembly of components, and one or more through holes (2), at least one of said holes (2) comprising a first section (23) suited to house a lighting body (3) facing towards the emissive side (12) of said substrate (1), and a second, larger section (24) for diffusion of the light emitted by said lighting body (3).
