This Insane Homemade Lightsaber Burns Straight Through Things
OK, so this should be labelled with extreme hazard warnings or something. A crazy laser enthusiast actually built his own lightsaber capable of burning straight through things. The monster 3W laser, made from a diode taken out of a DLP projector bolted to two high-power lithium ion laptop batteries, is capable of burning straight through…
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Sam Gibbs - Gizmodo UK