The present invention relates to a light signalling device comprising a filament light bulb (3) mounted on a support (8), a reflector (5) consisting of a frustoconical wall extending, widening, from the support (8) towards an outlet screen (7) and at a predetermined flare angle (alpha) with respect to the optical axis of the device, a shield (6) enveloping the light bulb (3) and contained inside the volume defined by the frustoconical wall; the shield (6) comprising a lateral wall (6B) having a plurality of strip-like through-openings (10, 11, 12) arranged one above the next, these openings allowing corresponding beams (4B, 4C, 4D) of rays of light (4) emitted by the bulb (3) to pass through the shield (6) and be reflected towards the screen (7) by the frustoconical wall of the reflector (5) thereby forming light images that are contained inside one another in such a way as to generate a three-dimensional visual effect.