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in theory you should be able to use your dive light if it is strong enough think UK C8 should be at least enough. The bigger issue is color temprature of the light. You will have to find out what it is and set your cameras white balance accordingly. If you try to use it with an internal flash the color temp will undoubtadly cause issues. If you are just useing the dive light it will function as a hot light. In doing that however you will also have to dial in your iso and f stop accordingly. I have shot millions of frames on land with no flash at all and in far worse conditions. I assure you that you can do this in the water as long as your distance to subject is not more than a few yards at most.
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