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Believe it or not, this is an energy saving light-bulb powered with 2 AA battery’s… with just a few steps, you could have this as an emergency light in a SHTF situation. Its basically parts from a disposable camera, wires an energy saving light-bulb and 2 AA battery’s.
I have not built one but by the looks of the photo, the light it produces is just phenomenal, as this instructable is a few years old, you could substitute the old energy saving light bulbs and put in the newer LED bulbs and get a longer life from the flashlight, check out the tutorial and be prepared to be blown away by the awesome hacks involved to get this flashlight.
This could be used for camping, bug out bags and at home if the power goes out. Remember, this is not necessarily a flashlight replacement but it gives you the opportunity to learn how you could make one from items around the house.