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

Julian Ilett writes: 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). Monster 7,500 […]

from Electronics-Lab.com Blog http://ift.tt/1k6V2yq
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