I just built a headlight with 3 LEDs from Seoul Semiconduction (P4 bin). They advertise 240 lumens each at 1 amp. 720 lumens at 1 amp draw is amazing!! I don't run it at the highest setting because the 700mah setting is plenty bright. At that setting, the 4400mah lithium battery lasts for my entire week of commuting (~150 miles). To be fair, I only run the light on solid on the way into work (9:00pm), and run it in flashing mode on the way home (7:00am), but those are still good runtimes on a single charge.

Steve