A thing that may be a factor to consider: many dive lights are designed assuming they are water-cooled...immersed during use. All of my dive video lights expressly warn not to use them for any length of time out of water, as the lamp head will overheat. My lamps have fairly high lumen output, and are a few years old...your lamps or newer versions may not be as temperature-sensitive. But thought I'd mention it. They're too spendy to burn up.
--Richard