I have a coleman propane latern...thing puts off some good heat and a ton of light.

I always have 2 flashlights in my pack, and plenty of extra batteries. I have one superbight cree light that could easily be used for spotting, and have 2 extra sets of batteries for it...they last about 1-1.5 hours per charge. the other is a maglight for various things and can probably go 6 hours on a couple AA's.