What you would probably want, is a 5 watt high flux bin Luxeon Star, 2 of those Electrolumens 3toD battery holders, and a hotlip heatsink. Most of the above mention parts are not too hard to order online, and if you want, I can help you epoxy the LS to the hotlips, wire up your mag.
Hotlips: $??
3toD x 2 = ~$8 x 2 = $16 USD
5 watt LS = $30 - $45 USD depending on how high a bin you can get
Artic Alumina Epoxy = $20 SGD @ Video-Pro @ Sim Lim Square
Fit everything together = FOC for worksmanship, maybe some $$$ to cover my transport cost? /ubbthreads/images/graemlins/smile.gif
Mag 2D = something I presume you already have.
Of cos if you don't want to go the 5 watt way, you can have 2 of those 3toD adapters running a 5 cell mag lite bulb, now, that's really very easy to do. Or if you want higher brightness, one of those WA bulbs potted in a PR base from Carley. There is a WA group buy going on now in the "Group Buys And Passaround" forum. You might want to pop by for a look
If there are any questions, feel free to mail me at nerdcase(at)singnet[dot]com[dot)sg