DIY Caving lamp made from garden pond light?

Randolph Lozoya: http://ukcaving.com/board/index.php?topic=12596.0

Dick Ovdenk: Pond lights are usually wired into a power source. So to use one for caving would require some sort of battery so the light would work. And pond lights are normally heavy. That could be uncomfortable assuming you could carry the battery as well as the light.