I have two of these relics - one each in pool and spa - trying to turn on either trips the circuit breaker.
These appear to be line voltage (yes, 120 vac under water). I pulled the 4" spa light to see how it worked (and maybe make it actually work).
I didn't learn much, and it still doesn't work.
Are there products which can easily be placed in these old lights - a direct, disconnect the wires, pull the light, cut cord and stick in shiny new battery-powered, remote-controlled fixture?