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I'm of the general opinion that darkness is your friend. Also, in a place like your home that you know very well, you're going to have a definite advantage at moving around quickly and quietly in the dark, whereas walking around with a flashlight is going to advertise your presence.
That said, I think a lot depends on the scenario. If all the lights are off and your eyes are adapted to the dark, as if you were asleep and woken up by a noise, I'd probably leave everything dark until I had a better idea of what was happening. A strong flashlight is great for lighting up (and hopefully blinding) the intruder when the time comes, but you have to find him first.
On the other hand, if you're awake and have the lights on, turning them off would just leave you impaired, so there'd be more of an incentive to turn on the lights or use a flashlight as you check rooms.
In general I'd say as long as your night vision is functional, use it as much as you can.
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