If you think the water is coming from the light/exhaust fixture, I would hang something under it, like a piece of paper or plastic, to verify that it is the source of the water. If that is the source, and there is no condensation on the fixture, then I think it would be a roof leak. But, most houses do not have a roof penetration immediately above the light/exhaust fixture. The exhaust duct usually goes horizontally toward the nearest exterior wall and discharges through the soffet.
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