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Made this little LED jar light for my kids to use in the tent. Safer than paraffin / kerosene my wife felt. It lasts all night if they turn it down low, on full it goes about 1 1/2 hours but is very bright. Used a small 3.7v lithium battery from somewhere..heatsink from somewhere salvaged again... It charges from an old phone charger - 5v. Used a Cree LED, so it's very bright. Oh, variable resistor for the dimmer, salvaged again.