In reply to Timmd:
As far as I know... there really ain't one.
Perhaps the best to look for, would be an industrial rated headlamp (preferably one which is allowed to be used in ATEX classified areas). It would be spendy though, and also heavy.
The problem I see wiht headlamps, is that there's quite a few tiny welds and then you rattle the lamp around (in the car, rucksack and so on). As far as I see, majority of the problems boils down to this (bad contacts, or possibly condensation shorting things out).