The Oxford Thesaurus An A-Z Dictionary of Synonyms - illuminationn.

1) lighting, light, brightness, radiance, luminosity, incandescence, fluorescence, phosphorescence: The illumination from the fire was barely enough to read by. 2) enlightenment, insight, information, learning, revelation, edification, instruction, awareness, understanding, clarification: It is astonishing what illumination his lectures brought to his audiences.