The Surefires are about the same size as an AA Maglight and are beyond bright. They will light up any room/path whatever. It’s like using a car headlight. The special batteries last about an hour. If you get them on-line they are about $1 each. If you would like more light, Surefire offers an upgraded bulb assembly (with about half the run time).

However, the Surefires get hot, very hot. The light will get hot enough to burn things so be careful.

I’d get a 6P before I bought another G2. The plastic is fine, but aluminum is better and I think the 6P has a lock-out tail cap and a Pyrex glass lens. The new G2s come with a lock-out tail cap (I think) but I only have several of the old models. Without a lock-out tail cap, I don't store batteries in my G2s.

Other lights:
An AA Maglight with a Night-Eyz LED replacement kit is pretty good. Plus it will run on standard AAs.
Nuwai Q3s are very nice and use a LED
Inova makes some excellent LED lights.
Streamlights are good. The 4AA LED ones are also waterproof.
CountyComm has little LED lights for $1 each. I have them scattered all over.

Yes, I live in a place with frequent power outages. Plus I like gadgets.