I found this patent relates to DIY RPTV's (using large LCD panels)...so the info inside might be of use for our reference


http://www.freepatentsonline.com/5897192.pdf


Whats maybe of interest is the talk of using a free form condensor lens to even out the light distribution from an elliptical reflector with bold claims in efficiency improvements.....first Ive heard of a free form lens..!

DAZZ ?