Luminaire lens insert

An elongated luminaire for illuminating an area therebelow comprising a linear light source, an elongated primary prism having a bottom section and two side sections on either side of the bottom section, said bottom section of the luminaire is formed with a series of parallel prisms extending from the center of the bottom section of the luminaire to the edge of the luminaire, said prisms having an included angle fixed in size and an included angle which increases in size as one progresses from the centermost prism to the edgemost prism of the bottom section, the sides of the luminaire have a plurality of parallel prisms which extend from adjacent the bottom section to adjacent the top of the side section and said prisms have a fixed size included angle and an included angle which increases in size as one moves from adjacent the bottom section to adjacent the top of the side section, said sections having prisms formed on the sides thereof facing the light source, said prisms constituting light incident and light emergent surfaces for redirecting and emitting light rays from the light source generally away from a vertical plane passing through the axis of the linear light source and into annular ranges on either side thereof, and a lens insert means between the light source and the primary prism, said lens insert having prisms on the side thereof facing away from the light source, the distribution of light from both the primary prism and lens insert being such that substantially half of the light distribution will emit in an area of 0.degree. to 30.degree. from the vertical plane and substantially the other half of the light is distributed in an area from 30.degree. to 60.degree. from the vertical plane, and the light actually is distributed in two zones either side of the vertical plane.