Go with a can, draggin around a bulky hand held cannon is a pain in the but. A nice little 10W HID is plenty for most diving here in NE. The burn times are more than enough for 2 long dives with big steels, and provide good light in a small package. The heads are easily clipped off onto a D ring when you don't need it, and slips onto the hand, and out of the way when you do. You still have full use of both hands with a can light, as opposed to a cannon where you have to tie up a hand to hold onto it. They are a bit pricey, but are well made for the most part, and impossible to loose. I have found lots of very expensive cannons sitting on the bottom, because the stupid lanyard slipped off a wrist, or broke loose from a plastic snap. A good can, and a decent backup will carry you as far as you want to go in diving, and you don't need to go nuts with big 21 W lights when you don't really need them for your diving at this time. If in the future, you find you want to carry your diving into deep or tech, you can upgrade. But you will allways find a use for a good little 10 W light no matter what you choose to do. ..... Only MY opinion.
