portion of the wall closest to system 110 that is in the exemplary illustration in which system 110 is located near a lower portion of wall 22 etched portion 118 of cover lens 116 directs a portion of the light out of system 110 primarily toward the bottom portion of wall 22 thus eliminating dark spots near the bottom of wall 22 according to the exemplary embodiments the asymmetric tir optic 112 elliptical diffuser 127 and partially etch cover lens 116 provide illumination more suitable to providing uniform illumination of surface 20 of wall 22 than prior systems such as system 10 illustrated in fig1 and 2 according to the exemplary embodiments this improved illumination profile is achieved without the need to tilt any of the system components as is commonly done in conventional wall wash illumination systems furthermore a higher portion of the output light from the illumination system 110 is directed onto the wall that is an increased coefficient of utilization is realized by illumination system 110 of the present disclosure fig4 includes a detailed schematic cross sectional diagram of asymmetric tir optic 112 illustrated in fig3 referring to fig4 asymmetric tir optic 112 includes light source 126 which in some exemplary embodiments is an led light source light source 126 emits light into asymmetric tir optic 112 by reflection of the emitted light from inner walls 125 of asymmetric tir optic 112 light pattern 124 is generated and.