A source of lighting/energy back in the day that I never knew about

A source of lighting/energy back in the day that I never knew about. I got to hold one today. Thought you guys would like this. I wouldn’t say advance tech, but very very cool.
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Carbide lamps, or acetylene gas lamps, are simple lamps that produce and burn acetylene (C2H2) which is created by the reaction of calcium carbide (CaC2) with water (H2O). Acetylene gas lamps were used to illuminate buildings, as lighthouse beacons, and as headlights on motor-cars and bicycles.