A lighting system comprises at least one plurality of lighting units and at least one joint, connecting two or more units; the joint comprises a central support extending along a first rotation axis and two or more arms, radially projecting from the support and hinged in a rotary manner to the support to rotate with respect to the support about the first rotation axis; each arm is hinged in a rotary manner about a second rotation axis, orthogonal to the first rotation axis to a connection head fixed to a lighting unit.