We love having an underwater light for our boat; it's great entertainment to see what comes in at night. On charter
trips we've done in the past we've brought a 24" LED tube light that we drop over the side and connect to the house batteries
with alligator clips. On a personal boat, you could have an actual plug
to connect the lights instead of alligator clips. We've debated permanent lights for our new boat
, but we're not sure about drilling holes in the boat for them, plus it's something else to have to scrape around when cleaning
. The induction powered ones above are pretty interesting though.
Here are a few pictures of stuff we've had come in at night; you can see the light in the first picture: