I've had the HLX712L for a few years and it is a great light. It does use 2x123, so I don't know if that will disqualify it from your intended use. It is lightweight enough to feel comfortable with its all upfront design. Some heavier lights don't feel good like this and need to have the battery pack in the back for balance, but then you loose some dependability/ruggedness due to the wires/connections.
This can run using rechargable 3.0v RCR123s. I got mine from MattK at BatteryJunction.
I've used this headlamp cross country skiing, mtn biking, hiking/backpacking, insulating my attic, and caving. It has held up great. I think its the best value in a bright headlamp. I believe I've seen a 3 watt Lux version of this also.