From having done some caving a couple decades ago, I have some first hand experience with carbide. Yeah, carbide + water gives you acetylene gas and quicklime in very short order:
CaC[sub]2[/sub] + H[sub]2[/sub]O -> C[sub]2[/sub]H[sub]2[/sub] + CaO
The calcium carbide, as sold for miner’s lamps, looks like blackish-gray gravel. It smells of acetylene because it tends to react with the moisture in the air.
Spent, you wind up with this wet quicklime slurry to get rid of. Hopefully, not still producing acetylene.
The reaction itself is not terribly energetic, but, as noted, the acetylene gas is very flammable, and to be treated with caution.
That doesn’t stop people from doing stupid things with it. I know of a case where a couple bozos decided they wanted to see what it would be like if a whole couple of pounds of the stuff were used at once, and tossed it in the toilet on the grounds that if it got out of hand, they could flush it (that, in and of itself, displays a certain lack of understanding of the process). Well, they tossed a match, and COULDN’T flush it because the flames were too high to let them reach the toilet handle. Probably just as well.
A fringe benefit is that the stuff is good for starting campfires - pile the wet & soggy wood over some tinfoil or a tuna can full of carbide, and you can have the novel experience of getting your sputtering fire going better by pouring a bit of water on the carbide.
BTW, on the lamp description - most lamps actually have a striker wheel and a flint on the outer edge of the reflector, so you don’t have to light it with a match. The technique is to hold your hand over the reflector, letting the gas accumulate, then rapidly palming the striker wheel while moving your hand away. With luck, the lamp goes “whoompf” and is lit.
Another topic for you to look up is “carbide cannons”.