Could be, though that sort of leak usually ends up in the ceiling or around the inner sides of the windshield. The lights are in the front cap, so the water trickles down the inside ofthat.
Other possibilities: The leak you describe is a fairly common symptom of a leak where the front cap joins the roof & body, or possibly where the roof joins the sidewall above the door, so check those too. Also check the mounts for the door awning.