This program looks soo damn sweet, I am dying to play with it to see what it can do:

http://www.opticalres.com/products_f.html#lighttools

Those of you still in college can get it at a reduced cost, although I don't know what that would be. But surely in 30 days a person can come up with their own design and get it in this program to see how it does. i know there are a lot of people good with the 3D stuff here, so give this a try. I know I will be.