Actually, I've measured the surefire 6P with the Malkoff M60LL at close to 18hrs at full output (appx 4000Lux). See this thread for the graph:
http://www.candlepowerforums.com/vb/showpost.php?p=2815326&postcount=108
If you want to go brighter, get yourself a 9P (or G3L) and the M60LL. It...