I just bought a Wolf-Eyes Sniper with an MC-E LED in it.
In the low-mode (unfortunately, this is the third mode, so you have to extra-click the switch twice) this light will have a runtime of about 50 hours on a single 18650 battery.
Take two of these batteries with you, and you have the desired 100 hours.
Especially for camping, this is a great light. For lighting up "your" area on the camping-site, you need a floody beam, not a thrower - and that's exactly what this one has.
As an added benefit, you get in the other modes too - you'll have a portable SEARCHLIGHT in your hand if you just leave it in the high mode! An incredible wall of light will be yours.
I first was tempted by single-mode lights too, but the ability to adjust the light AND the runtime for the given task has made me look more to the multimode lights nowadays (when it comes to LED-lights - I still am an incan-man by nature. But to have 100 hours runtime, you would end up with no-light with an incan. Here, LEDs rule! However, multi-mode incans are a reality - the SureFire 9AN commander simply has two bulbs built into its single reflector....)
Timmo.