Powerful dive-light instead of flash for camera?

Hi everybody.

I'm trying to figure out which light/torch I should buy. I have surfed the
net looking for recommandations, but I find it hard to "translate" the
technical specifications into how the lamp will "feel" in the water. This is
the reason why I would like to hear your experiences. I would like your
recommandations as far as brands, models, and where I can find them at the
best price. I have set up the following guidelines for my choice:

1. Primarily, I dive in Denmark. Wrecke dives, no penetration.

2. There has to be enough power in the battery for at least two dives.

3. I'm thinking about taking up underwater photography. If possible, I would
like a lamp, that can elimate the need for a flash. Is that possible and if
so, what light would you recommend?

4. Which brand would you recommend? I have looked at the Danish manufacturer
Z-light (http://www.z-light.dk/). Does anybody have any experience with
their products? I have also looked at Green Force, Treble Light and
Kowalski. What would you prefer?

5. Would you go for a canister light (one with an umbilical) or a more
traditional design and why?

Please share your experiences. My current light is a pistol-grip plastic
thing, that is so positively boyant that you have to wrestle with it in
order to take it with you down. Furthermore, the light is dim and uneven.
Finally, the light goes out when you get to 13 meters!

I should say that I'm not very handy, so builing it myself is not an option
unless you know how to transform a guy with ten thumbs into a fullblooded
metalworker ;o)

Best regards and thanks in advance

Peter Braun
Denmark