portion 4 and convex facets on the refractive surface 18 the front of the lens is provided with a shaped recess the shaped recess is in the shape of a cup being generally concave comprising an inclined surface 20 extending inwardly from the front face of the lens the inclined surface 20 meeting a generally circular base 22 of the cup shape the base 22 being convex in shape the curved convex shape is used to change the light beam angle the generally circular base 22 is provided with a network of refractive surfaces in the form of densely distributed convex facets the inclined surface is preferably concave in use the shaped recess forms a light emitting section 2 of the lens the portion of the lens between the hole and the shaped recess forms an optical body or lens 3 positioned therebetween it will be understood that the light entering section 1 the light emitting section 2 and the optical lens 3 are formed as a unitary or one piece body from the transparent material fig5 to 8 show a second embodiment of a lens in accordance with the present invention it is noted that this embodiment and those following do not feature the cut out at the end of the conical or frusto conical portion also the hole or blind recess is circular in section this embodiment and those following is further distinguished by the pattern of the network of refractive.