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to be lit (of a lamp, burner, etc.); to catch fire; to ignite; to start burning
to be turned on (of a light, appliance, etc.); to come on
部屋の電気が点いていますよ。
The light is on.
暗くなって街灯が点いた。
It got dark and the street lights came on.
湿っていて火が点かなかった。
I had trouble getting the fire lit.