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 room 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. Only the roof cap option does need supports.