I was tied up next to this old motor cruiser this season. I loved the table lamp in the 'window'. At night it was pleasant glow to see.
You don't see 'table lamps' on boats, for obvious reasons. But I had a dark area between the saloon and vee berth below in our boat, and that lamp got me thinking...
I had swapped out all the incandescent bulbs for LED's in our household bulb cabin fixtures. LED's are available in 12VDC household base in various wattages and color temperatures and I had a couple spares on hand. Lamp parts, remember those?
Sailboats like ours are smaller than that big cruiser - I'd have to scale things down. I knew small(4-6") lamp shades are available to fit chandelier bulbs. I bought a couple of those. Now a base. My dark space, has a high fiddled shelf under a port. We have Maine beach finds around the house and boat. A rolled rock, formed by eons of pounding surf on our granite islands, caught my. I drilled it for the threaded lamp pipe. Not high enough so I added another to make a cairn. I sat it in a doughnut of silicone (on an oiled surface) to form a non skid base. But I also tied the wiring below for security.
Not only did it light the passageway at night,.....
...it added another warm light on the harbor. Just what I was looking for in the port.
With extra parts, I put another together out of a cut of drift wood and a Lexan base for stability. For this one, I added a 16/2 cord and plug so it could be stored and used if you extra light.
Cost is about $20 per lamp, including a 7 watt bulb.