Thanks mtwieg,
Its just a couple of LED luminaires (10W to 40W) "attached " to the HFAC bus.......they are attached by inductive couplers. The HFAC bus is powered by a SMPS, which produces the constant current which is used by the LED luminaires..the bus is a loop of wire, but obviously its twisted together so the loop area is as small as possible.........the couplers literally just hook into it (you manually "pull" a bit of the bus out and hook it into the coupler....that gives the primary connection, and the secondary is inside the coupler, as you would expect )...thats all there is. (obviuosly theres the battery and the emergency led driver to power the lumiares when the mains fails...the mains provides power to the smps that produces the 50KHz HFAC bus.
Its not possible to get anywhere near as good waterproofing as this "Inductive coupler" method with any other practical method......as i mentioned, magnetic field can couple through the waterproof insulative coating of the wire......thers no connector gaps for water to run into.