Lighting louvers formed by transverse and longitudinal blades improve the performance of indirect ambient light luminaires by increasing light output, widening the output of the luminaire’s maximum intensity light, or both. The thermal and chemical stability of such polypeptides is improved compared to those properties of its corresponding wild type proteins. The wheel washer further includes a brush attachable to the arm, the brush being capable of movement both in and out with respect to a surface of the frame and being capable of rotation in either a clockwise direction or a counterclockwise direction.