Lighting device and corresponding method

A method of providing lighting devices, the method comprising:

• providing an elongated support structure having a longitudinal direction and electrically-powered light radiation sources distributed along the support structure, wherein the support structure includes at least one light permeable layer,
• coupling with the at least one light permeable layer at least one optical signal source mounted along the support structure for injecting into the at least one light permeable layer an optical signal undergoing total internal reflection propagating along the at least one light permeable layer in said longitudinal direction, and
• coupling with the at least one light permeable layer at least one optical signal detector arranged along the support structure for detecting the optical signal injected into the at least one light permeable layer by said at least one optical signal source.