Light indicator, which comprises: - a support body provided with a support face; - at least one light source arranged at said support face and provided with a light emission axis; - at least one optical lens, which is placed to cover said support face, is provided with an internal surface at least partially directed towards said support face and defining at least one cavity in which said light source is housed, and is provided with an external surface intended to come into contact with the external environment; said optical lens comprising: - at least one collimation portion placed to intercept the light emission axis of said light source, and arranged for at least partially intercepting light rays emitted by said light source and for projecting corresponding collimated light beams along projection directions that are radial with respect to said light emission axis; - at least one attachment portion, projectingly extended around said collimation portion, integrally made with said collimation portion, and sealingly fixed to said support body; - retention means connected to said support body and to the attachment portion of said optical lens and adapted to retain said optical lens integral with said support body; said light indicator being characterized in that said retention means comprise: - at least one retention body provided with a rod-like threaded portion, engaged in retention relationship within a corresponding engagement seat made in the attachment portion of said optical lens and in that said retention means comprise - at least one engagement element inserted within said engagement seat and provided with a threaded hole with axis, and the threaded portion of said retention body is screwed in such threaded hole. - a support body provided with a support face; - at least one light source arranged at said support face and provided with a light emission axis; - at least one optical lens, which is placed to cover said support face, is provided with an internal surface at least partially directed towards said support face and defining at least one cavity in which said light source is housed, and is provided with an external surface intended to come into contact with the external environment; said optical lens comprising: - at least one collimation portion placed to intercept the light emission axis of said light source, and arranged for at least partially intercepting light rays emitted by said light source and for projecting corresponding collimated light beams along projection directions that are radial with respect to said light emission axis; - at least one attachment portion, projectingly extended around said collimation portion, integrally made with said collimation portion, and sealingly fixed to said support body; - at least one collimation portion placed to intercept the light emission axis of said light source, and arranged for at least partially intercepting light rays emitted by said light source and for projecting corresponding collimated light beams along projection directions that are radial with respect to said light emission axis; - at least one attachment portion, projectingly extended around said collimation portion, integrally made with said collimation portion, and sealingly fixed to said support body; - retention means connected to said support body and to the attachment portion of said optical lens and adapted to retain said optical lens integral with said support body; - at least one retention body provided with a rod-like threaded portion, engaged in retention relationship within a corresponding engagement seat made in the attachment portion of said optical lens and in that said retention means comprise - at least one engagement element inserted within said engagement seat and provided with a threaded hole with axis, and the threaded portion of said retention body is screwed in such threaded hole.