Yeah, I can guarantee that is on dry land. First off, when you're diving, you generally want a very tight beam. The flood beams reflect off the water and can make it harder to see. Now, there are times for flood beams for sure, but I always go towards spot like beams. This light is super bright and has what, around 20k candela. Way to floody for being a high output light like that.
Second, water just sucks up light and bounces it back at you. I always cut my beam beam distance in half for useful light on land. So, 150m on land. I would say anywhere from a 3rd of that if you're lucky, to less than a 5th of that in the water. That's if you're lucky.
If the water isn't so clear, you're going to blind yourself with something like that on high.
Custom aspherical lights are fairly common with the guys I know.