Lighting accessories that can be installed in existing luminaire assemblies, as reflectors, are disclosed. The accessories are configured for placement above or on the side of a light bulb, where they can reflect a portion of the light produced by the bulb, thereby redirecting light to a useful area, increasing total light output, and reducing energy consumption. For example, a light reflector disclosed herein may comprise a substantially planar body having at least one substantially straight edge and at least two curved edges and a clamp affixed to a portion of the substantially planar body distal to the at least one substantially straight edge.