つく
to be on, to be switched on
The same つく as 付く attaching itself to things, except that what has attached itself here is the light. You come back from the shops and the front room is already glowing at you: つく.
Also written 点く. 点ける つける is somebody switching it on; this is it being on. Same reading as 付く つく, which is about sticking to things.
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