It looks like light was one of the primary issues. Without the ability to recharge from a wall outlet and assuming no one planned to bring a stash of batteries, charging flexibility and long battery life would have been important attributes.

I would have suggested the Photon Rex which has decent battery life and can be recharged via any 1.2 to 3 volt battery you happen to find or via an optional USB or solar charger. The Rex is bright enough to walk darkened halls and its small size makes it very packable.

Just as useful is the Pak-Lite. This is essentially a 9volt battery topper and they are cheap enough that you can buy a few. The real advantage of these lights is 80 hours of light on high and 1200 hours of light on low on a lithium 9 volt battery. Again, very packable.

Standard disclaimers apply. I have no financial relationship with the people who make either of these lights, but I love their products.

Craig