Prudence Island light sits on the east side of Prudence Island. It’s quite a long way out there if you try to shoot from Aquidneck Island. The shot above is taken from NEB in Portsmouth. You can take a ferry out from Bristol that costs ~$7 per person round trip. The ferry is only there for about 5 minutes while it shuffles passengers for the return trip, so you either have to shoot from the ferry dock or stay for an hour and a half until it returns.
View Prudence Island Light in a larger map