Via High Priest of a Low Cult, we've found an interesting light tutorial worth exploring....
Digital paint<
There seems to be very little information available in detailed form on what appears to me to be a crucial subject for artists of all kinds: light in all the guises in which we encounter it on a daily basis. I've read countless books dealing with digital and traditional art and the subject of light only ever seems to be touched on very lightly (pardon the pun). Yet to anyone wishing to create an illusion of reality should have a good understanding of how light behaves in the physical world.