While not yet a boat owner I've found that a head mounted lamp follows you around to almost any position. Ambient lighting
for some reason is always behind you and throwing precisely what you want to see into shadow.
Some companies sell head mounted lamps but I found two sealed 6V lead acid batteries put in series will push a 12V 10W bulb for 2 hours (about as long as I am willing to hunch over something before throwing a fit) or a 20W bulb (bright enough to bicycle at night in a dark rain swept forest.)
I love the ideas for LED ambient lighting
that changes between navigation and entertaining. I'd say the idea is "brilliant."