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mini mag flashlight
LED White bulb (I got mine at radio shack. Get the super bight white ones)
soldering iron with solder
copper wire
duck tape
watch battery (3 volts) (can be found at radio shack get a big one)
Instead of using a watch battery you can use 2 double A taped together with copper wire runing from one positive to one negative. (it is cheaper and it's a lot brighter) ( but it's bigger)
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Lithium batteries are NOT to be used in this fashion. They can start fires at over 2,000 F and be inextinguishable, until the oxygen is smothered.
If you're looking for a smaller and brighter flashlight, try a Fenix LD01 or a Streamlight Stylus.
I love my Fenix LD01 and it outputs about the same as a normal 4-D cell flashlight, but it only is the size of a AA battery, and takes AAA rechargeables.