Geko's Lasers Mod 1 7 10, 1 7 2
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Geko's Lasers Mod 1.7.10, 1.7.2 adds lasers to Minecraft. This mod is built as an add-on to Mekanism) will also work. (Note that if you do take this route, Thermal Foundation is still required)
Download Geko's Lasers Mod 1.7.10, 1.7.2