I've had the Gen4 pros completely apart and I concluded quite the opposite. Their design seemed to accommodate for every concern a light would need when performing the duties in a moist salt water environment. The fan and aluminum channel for cooling are completely sealed off from all the electronics via a gasket. Any salt creep that has accumulated in the fan and ducts wouldn't warrant their claim for water damage, it would have been a lot more obvious.It's pretty obvious. You create a light with a mount that has the light about a foot over a huge tank full of saltwater and then you add a fan pointing straight down to suck up any moisture that rises. I may not be an engineer but neither was the person that created the lights for Ecotech I can assure you of that, ha.
Given what I personally know about Ecotech, their had to be some irrefutable evidence to claim water damage.
I'm not trying to defend Ecotech, and I can't speak to your individual claim. That's why I asked the question, if they provided you with the evidence of water damage?