An illumination apparatus is disclosed in the invention. The illumination apparatus includes a cavity with a diffusion surface, a light source, a light-spreading device, and at least one optically-conditioning surface with a wavelike array formed thereon. The light-spreading device and the optically-conditioning...http://www.google.com/patents/US20060077685?utm_source=gb-gplus-sharePatent US20060077685 - Illumination apparatus
