The amber lenses for the ST4 Evolution lights alters the standard 5000 kelvin color temperature to selective yellow. Available either as a flat (0 degree) or reeded (15 degree) lens cover, the amber lenses are regarded as improving visibility in rain, fog, and snow conditions. The lenses are made from acrylic, and feature a gasket which helps prohibit water and dust getting between the lenses. The reeded lens is secured in place using 4 spring clips supplied with each lens.