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Monster 7,500 Lumens 100W LED Flashlight for under $10

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Published on Jan 9, 2014

I discovered that due to a lucky co-incidence of voltage and internal resistance, a 100W LED can be connected directly across the terminals of two 18V Nickel Cadmium power tool batteries. And that means you can build a 100 Watt (7,500 Lumens) flashlight for less than $10 (not including batteries).

Note: Don't try this with other battery types - you'll almost certainly fry the LED!

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