Author scored a cheap projector off ebay with the only problem being that the bulb was toast. Bulbs for projectors can run 100-400 dollars (yes for a light bulb). So he modified it to use a CREE LED. I like this mod as I picked up a projector a while back on the cheap with a bad bulb. Always wanted to fix it up.
http://diytronics.blogspot.com/2013/03/epson-emp-s4-projector-led-mod.html