A light-distributing diffuser for an electrical lighting fixture. The diffuser is rectangular in transverse section and is generally in the shape of an inverted truncated pyramid having an enlarged base and a reduced, outwardly-extending end. The outwardly extending end of the truncated pyramid is surmounted by a vaulted, quadri-faceted cap. The walls of the diffuser are formed with an array of fluted, groove-like channels extending longitudinally along the side and including arrays having channels of lesser and of greater radii of transverse curvature, the arrays being disposed symmetrically with respect to a longitudinally extending center line of each side. The cap is formed on each of four side-connected triangular panels thereof with a pair of laterally-adjacent arrays of fluted channels angled to converge and to intersect along a center line of each panel and along abutting side edges of said panels, to direct illumination diagonally and to achieve an essentially rectangular beam light pattern.

A light diffusion composite comprises a light diffusion material disposed on a prism sheet, wherein the light diffusion material is obtained by laminating a light diffusion layer including 100 parts by weight of acrylic resin and 100-220 parts by weight of spherical particles of polymethyl methacrylate on a transparent support. The light diffusion composite has better luminance in the front direction than the conventional light diffusion sheet and also has good light diffusibility.

A reflector for roadway use integrally spun from aluminum has a side reflector portion (A) of generally parabolic configuration, an inwardly directed flange (B) at the top for receiving a light source and a head fixture carrying same, and a lower end (C) entirely open to the atmosphere having about a 90.degree. cutoff avoiding directing light at an angle above the horizontal. The reflector is secured to the head by a fastener (D).

A new and improved luminaire combination is disclosed having a novel lens structure formed with a generally horizontal first lens surface and a generally vertical second lens surface with a generally horizontal flange formed on the second lens surface. The first lens surface is designed to refract a beam of light downwardly and outwardly in a predetermined pattern to form a beam having a cross section approximating the predetermined pattern at a predetermined distance below the lens. The second lens surface is designed to diffuse a beam of light outwardly in a direction perpendicular to the second lens surface.

A reflector for a lighting fixture comprising a substantially bell shaped reflector wall with top and bottom openings and a substantially parabolic cross-section. The reflector wall includes an inner surface having a first top portion that is textured for diffusing light rays from the light source of the fixture, and a second bottom portion that has a smooth surface allowing the light rays to pass through the reflector. The reflector wall also has an outer surface with a plurality of curvilinear prisms for reflecting the light rays. The inner and outer surfaces of the reflector create an even distribution of light emanating therefrom.