If you guys are looking for an underwater lighting idea for gigging, or nighttime underwater, here is an idea for ya:
Down in south florida when we go bully netting at night for lobster, we used 2 standard lights from a car angled out to create an approx 135-160 degree of light, sealed off/waterproofed the electrical connections, and mounted it to the trolling motor... We would use an old set of jumper cables, one side wired into the lights, the other used to clamp onto a battery. This setup is very inexpensive and really lights up the water.... we would see lobster crawling around some 30-40 yards a way in any direction... Battery would last several hours without any issue.... Plus having it mounted on the troller, you can turn the lights in any direction you want....