Jonathan, if you want to try something more along the lines of
what Russell was talking about, have a look at this controller

http://home.clear.net.nz/pages/joecolquitt/5w_luxeon_sm.gif

http://home.clear.net.nz/pages/joecolquitt/5w_luxeon_table.gif

It's for a 5W Luxeon. AIUI the one you want to use is 12W
(that's bright - ya havin' a party ?). Russell may be able to suggest
coil and semi mods for that extra output current

You could also search out the candlepower forum

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist