Could you give us a little more info on the light? I tried looking it up, but there isnt much info on it. My only suggestion would be to upgrade to a U2 bin seoul for a tiny, probably undetectable amount of increase in light. But if the led isnt being driven at its full potential, you may be able to upgrade the driver board for more output. This would of course shorten your runtime which might not be good underwater. It looks like it uses a lithium battery? If so, what size and how many? It also looks like it has an optic instead of a reflector. Thes the optic fall out if you take off the head? I was thinking you might be able to Fit a P60 sized drop in, in which case you could install a nice M60 from Malkoff with possibly a WH tint for underwater, or even a custom P7 or MCE dropin. I've read that the greenish tinted light penetrates coastal waters the best. Where do you scuba?
