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the LED itself is encased in epoxy, what probably happened is that the water in the housing shorted past a resistor and that bumped up the voltage. Presumably at some point in the future marine LED systems will hall have power conditioners like the high end land locked systems, and you will not have to worry about overpowering them. Something like a Flyback diode or a TVS is needed to prevent any damage from accidentally pluging in to 24V, although a system that leaks into the housing will still suffer shorts and failure.
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