Alternative current or compact fluorescent underwater?

I am trying to build a continuous underwater lamp that will do video and still… no more strobes.

I would like to try 2 conventional 40W Compact fluorescent lamp that do 2200 lumens each.

Pros: affordable, easy to replace, no heat management

Cons: big, heavy

Problem: It implicates alternative current underwater, and no one uses AC underwater: pool, boats, diving, etc.

Is there a reason why I should not use an AC or compact fluorescent underwater?

I just found possible answers: 40 000 Hz with salt water might be a problem. The emitted radiation could be a problem for fragile corals. LEDs produce more Lm/w... it means a smaller battery, less weight.

Power compact lighting is commonly used on aquariums and corals like it just fine. AC current however is not :-)

Cheers

James