The present invention relates to a lighting device comprising a light concentrator device operatively associated with a light source comprising a plurality of LED devices. The light concentrator device is composed of a solid transparent body comprising: a first surface (51), at which a light input section (5) is defined to receive the light radiation emitted by the light source and—a second surface (61), at which a light output section (6) is defined to transmit a light beam having a ring shape and a plurality of protrusions (7) that protrude from said first surface, at said light input section, said protrusions acting as collimation lenses of the light radiation coming from said light source and—a plurality of reflection surfaces (8, 9) of the light radiation received from said light input section, said protrusions and said reflection surfaces being mutually positioned so as to convey the light radiation coming from said light source along a predefined path, which extends internally to said transparent body, between said light input section and said light output section.
