Lighting device and corresponding fixing system

1. A fixing system for one or more lighting devices comprising,

a first lighting device comprising

an elongated flexible body having at least one light emission surface, the flexible body having at least one longitudinal groove extending along the elongated flexible body, wherein the elongated flexible body comprises a casing of at least partly light-impermeable material and coupling of a portion of the first lighting device corresponding to the light emission surface to the casing protects the first lighting device against penetration of external agents, said groove formed in the casing and where the groove has a tapered cross-section with a restricted mouth portion for receiving and retaining in the groove a complementary coupling element, and wherein the groove does not interfere with emission of light radiation from the first lighting device; and

at least one fixing element with at least one elongated rib having a restricted stem portion and an enlarged head portion, said at least one rib insertable into said at least one longitudinal groove of the first lighting device;

wherein a material of the at least one elongated rib is more rigid than a material of the elongated flexible body.

2. The fixing system of claim 1 , wherein said fixing element includes a wire-like flexible body with a pair of mutually opposed said elongated ribs insertable into respective longitudinal grooves provided in a pair of lighting devices, the lighting device comprising a pair of said longitudinal grooves extending along said elongated flexible body.

3. The fixing system of claim 1 , wherein said fixing element includes a base element attachable to a mounting surface and carrying said at least one elongated rib.

4. The fixing system of claim 1 , wherein said fixing element includes a clamp having at least one clamp arm carrying said at least one elongated rib.

5. The fixing system of claim 1 , wherein the side of the elongated body having the at least one longitudinal groove extending therealong is substantially planar to minimize rotational movement when the first lighting device is coupled to a second lighting device.

6. The fixing system of claim 5 , wherein a second side parallel to the side of the elongated body having the at least one longitudinal groove is also substantially planar to minimize rotational movement when the first lighting device is coupled to a third lighting device.

7. The fixing system of claim 5 , further comprising the second lighting device coupled to the first lighting device via the at least one rib insertable into the at least one longitudinal groove of the first lighting device; and wherein a side of the second lighting device substantially abuts against a side of the first lighting device over their entire area of both the side of the second lighting device and the side of the first lighting device.

8. The fixing system of claim 1 , wherein said tapered cross-section extends along a substantially circular path with said restricted mouth portion arranged at a chord of said circular path.

9. The fixing system of claim 1 , wherein said at least one longitudinal groove extends laterally with respect to said at least one light emission surface.

10. The fixing system of claim 1 , wherein said at least one longitudinal groove extends in a diametrically opposite position with respect to said at least one light emission surface.

11. The fixing system of claim 1 , further comprising a pair of said longitudinal grooves extending along said elongated body.

12. The fixing system of claim 1 , further comprising at least one longitudinal rib extending along said elongated body, said longitudinal rib having a restricted stem portion and an enlarged head portion for insertion into said at least one longitudinal groove of a homologous lighting device.

13. The fixing system of claim 1 , wherein said elongated body includes a casing of at least partly light-impermeable material and wherein said at least one longitudinal groove is formed in said casing.