Petzl Ultra is that, at 350 Lumens it doesn't come any brighter as a headtorch.

As an all-on-the-head version of the ULTRA BELT headlamp, the ULTRA offers unbeatable fit and balance on the head. Designed for action and activities where powerful lighting, mobility, freedom of movement, and speed are key elements for performance. The ULTRA adapts perfectly to the needs of the user with its range of accessories. The ULTRA extension cord offers the possibility of moving the battery pack off the head in order to reduce the weight on the head, or to prolong battery life in extreme cold by keeping the battery pack warm under clothing.

Specs:
Economy Setting 40m 16h55m
Optimum Setting 80m 5h05m
Maximum Setting 120m 2h
Weight with batteries 345g
Recharchable battery

They simply don't come brighter than this!