I'm looking at these two things:

http://www.amazon.com/Fenix-LD15-High-Pe...3395&sr=1-1

http://www.amazon.com/Fenix-Accessory-Ki...3435&sr=8-1

The second item is just to get the white cone diffuser. The other included accessories look to be pretty useless to me.

Runs on a single AA battery, and is advertised as 117 lumens for 1.5 hours or 8 lumens for 39 hours. You could store a couple of spare AA batteries with it and have a very long time of light. It will stand on end to act as a lantern. With the white cone diffuser it looks like it would make a very nice little lantern.

I have one of the Target "Rock River" lanterns. It was cheap. It is bright. Batteries last forever. But it has a lot of glare if your eyes are in line with the LED/reflector. Wrap the plastic shield with masking tape or wax paper and it's much more pleasing to the eye, albeit dimmer.