An illumination apparatus that includes a housing, at least one light source and a light-altering device. The light-altering device is positioned relative to the housing and the light source for receiving and altering light from the light source such that the altered light illuminates at least one of...http://www.google.es/patents/US6874909?utm_source=gb-gplus-sharePatente US6874909 - Mood-enhancing illumination apparatus
