Best bet is an inverter to 120v AC and Kino Flos. If your marine battery is 12v there are many commercially available inverters; you can extend the service by wiring several batteries together in parallel. Mole Richardson used to rent a battery set with 10 @ 12v deep cycle batteries (like marine or golf cart cells) wired to provide 120v DC so you could use conventional lights like 750w or 1k babk softs. Kino Flo also markets an inverter set (probably rental only) that's very capable for the type of use you mention. check their website for more info.