I modeled this after the box art of the tabletop game Forbidden Island.
The tower is hollow so you can add a LED inside, the base has some from for a... battery but it's not specifically designed for any particular setup.
There are files for merged whole model (still hollow) and separated roof options.
Funnily enough a LED tealight could be used upside down like in one of the pictures to make it look like a lighthouse! For that to fit better you should scale the model up a bit and print the flat roof option