The laugh here is sort of self-deprecating, and that'll hopefully make a little more sense when he answers (or maybe it won't! who knows, he has problems): "We should be all right, at least in Valdis; it's my own, mostly, supplemented by the stroppy little thief I worship." This really is how he talks about his goddess, she must just love that.

"I think the phrase is, ah, 'master switch'? I am that, in effect. Thus far I've managed not to startle myself into lighting up the entire place at once."

(Not by accident, anyway; he did play with his new creation just to see how versatile he'd managed to make it. Very, as it turned out! Everyone's very glad he's stopped messing with the lighting unnecessarily.)