No takers for simple LED tape lights fitted under a shelf or trim?
Dare say there's a marine version if you want to pay 5 times as much.
I experimented by pointing some LEDs up, to bounce off the white liner, and it gave a really nice suffuce light. Ditto, instead of lighting up a whole space, only using them where they were needed, eg lighting under steps.
The strips still seem to use a bit of power though, a metre length in bright light is 9.4W!
If I were to do under the bookshelves on each side of the cabin and that ends up approaching 50W. The counter argument other than "in practice it'll be less than that" is that I don't have to use them when away from shore power.
Do you light up your boat like or more than your living room?
I found one rechargeable LED torch, bouncing light off the headlining gives me enough.
I'm very happy with these but they weren't cheap. (I'm not sure you can buy them now)
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Try "352 results for cabin lamp boat" on ebay.