5.11 Tactical makes a 470 Lumen Headlamp that runs on either 3/6 AA or a rechargeable Lithium battery.
5.11 Tactical S+R
CreeŽ XP-G2 Spot Beam
Dual LED floodlights
High and low light modes
90° vertical rotation
LED battery charge indicator
Water resistant high impact polymer
Runs on three (6) AA batteries
Elasticized non-slip headband
Aluminum heat sink
High Mode Flood only: 229 lumens/18 hrs.
High Mode Spot only: 360 lumens/15 hrs.
High Mode All lights: 470 lumens/10.5 hrs.
Low Mode, Flood only: 15 lumens/262 hrs.
Low Mode, Spot only: 123 lumens/41 hrs.
Low Mode, All lights: 134 lumens/37.5 hrs.
- See more at: 5.11 Tactical S+R
Found this 5000 Lumen one on Ebay
3X CREE XM L XML T6 LED 5000LM Rechargeable Headlamp Headlight Charger Battery | eBay
You can find some even brighter ones out there with Cree LEDs in them. The only thing is, you can never tell if they are blowing steam or not. Also they can be misleading when it comes to things like runtimes. Many lights say high lumens, X amount of life, but the life is usually rated for the lowest settings.
The 5.11 light is the highest quality one I have found that actually lasts 10.5 hours on high like it says.