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It seems very well put together. It has a screw in it to keep you from turning the focus to far. guess that keeps you from flooding it...however the screw is removable so you can clean it. As far as the other light being rated at 180 lumens its a Gladius. And I might have said it wrong but the big blue light is quite a bit brighter than it is. I have no idea what the beam angle is on the Gladius.
I'm curious what the focus is like UNDER water. That spherical lens in the water could change it quite a bit.