Quote - I did this one using a one sided square prop. I plugged the lighting map into the diffuse and ambient  colour nodes, and added a transmap in to the transparancy node!

Where did you get the lightning map?

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi