Both are definitely problems but right now you have an even more urgent one because a leak near a light fixture is a serious electrical hazard.
Roof leak water move around.
Often wind driven rain comes in from above the roof especially around windows between corner boards and siding and through cracks and knotholes in siding.
The drip is often.
A roof leak is always a cause for concern.
Water doesn t always come in at the shingled surface.
Even if the roof leak is caused by a windstorm or a tree.
When there is water leaking from a light fixture in the ceiling you either have a roof leak or plumbing leak that needs to be fixed as soon as possible.
Recaulk the corner flashing if any areas have hardened caulk.
The water damage from a roof leak can extend well past the location of the leak.
Reasons for a roof leak on an external overhang.
Move the light up the roof and away from any drips to find where the water enters the attic at the dormer.
The light reflects off the water as it enters the attic near the dormer.
Dormer walls provide lots of spots where water can dribble down and enter the roof.
A standard homeowners insurance policy will cover water damage and roof leaks unless they re the result of gross negligence on your part.
Replace any missing or rotted siding above the step flashing on dormers.