A one-piece molded lens member for use with a plurality of LEDs in a luminaire includes a generally planar base portion having an upper surface and a lower surface and a plurality of optical structures arranged in rows and columns on the base portion, each optical structure having a hemispheroidal section extending upwardly from the upper surface of the base portion and a first hemicylindrical section extending upwardly from the lower surface of the base portion and from a side of the hemispheroidal section, the optical structure having upper surfaces contiguous with the upper surfaces of the base portion.