Lighting device, in particular light signaling supplementary device for rescue and emergency prioritary vehicles, heavy transports and vehicles, work machinery

The invention concerns a lighting device (100) comprising a light source (141, 142, 143) placed on a disposition plane and a semi-parabolic reflector body (120) for the conveying of the light within a predefined exit angular aperture of ± a of the light beam with respect to said disposition plane, and wherein the semi-parabolic reflector body (120) is suitable to be rotated around a rotation axis (150) that passes in correspondence of a center of said light source (141, 142, 143) and is perpendicular to said disposition plane, in such a way to obtain a light beam which spans a predefined maximal angle around said light source, the lighting device being characterized in that: - the light source is constituted by three or more LEDs (141, 142, 143) which are placed on corresponding application points on said horizontal plane and provide an overall emission beam; - said rotation axis (150) passes substantially through the center of the circumference of maximum radius r passing through the application points of at the least three LEDs among said three or more LEDs and enclosing all said application points of said three or more LEDs (141,142,143); - said maximum radius r is equal or larger than 2.3 mm; - said semi-parabolic reflector body is a portion of a parabola having a parabolic symmetry axis (160) perpendicular to said rotation axis (150); said disposition plane whereon said three or more LEDs (141, 142, 143) are disposed is placed at a distance d from the focus of said parabola, distance d being predetermined in such a way that an application point of an equivalent source of said overall emission beam finds itself substantially on said focus.