| 摘要 |
Lighting apparatus 1 comprising a casing 3 in which a luminous source 4 can be disposed, this casing 3 having a window 9 for light to be let out, which is fitted with a wall, preferably with symmetry of revolution, transparent and made of a synthetic material 9, which is fitted with a conical hollow 11. The inner surface of the wall 9 is fitted, at least in the hollow 11, with an annular prismatic refraction profile, the angle of refraction contained between the lateral faces of the prisms of the profile in the hollow increasing step by step, seen from the luminous source 4. <IMAGE> |
