a lamp reflector comprises a pre - formed member molded from a polymer into a smooth and continuously curved shape . the members have a rigidity characteristic sufficient for maintaining its shape . a reflecting layer is bonded directly to the molded member to provide a reflector surface without facets or sharp angles . the shape of the member is comprised of a rear portion being an involute spline and side portions being defined by conic sections . the method of providing such a reflector decreases the amount of light reflected back into the lamp and trapped or absorbed within the lighting fixture . the method further eliminates the need for adhesive layers between the metal reflecting layer and the substrate which generally decreases the optical efficiency of the luminaire .