I would be nervous about the LEDs getting wet, and or causing heat stress on the brace. I know LEDs don't get all that hot, but heat>glass>splashing water might not be a good thing. Rusty had an oceanic center brace crack because of heat stress from a MH light.
LEDs do NOT get anywhere near hot enough to put any kind of stress on a center brace! I personally would not run LEDs without protection from the water. They are electrical and as we all know, salt water is corrosive!