I need to replace an old 120v pool light. An electrician recommended that I use the opportunity to switch to a 12v light since they are safer. I asked the question ‘If done correctly, aren’t both safe?’ His response was that if something goes wrong/breaks, etc. the safety for a 120v light is totally dependent on the function of the GFCI breaker. If that breaker fails too, your dead. He said that a 12v light does not have a failure mode like that – if 12v were to somehow short through the pool you would be ok.
In other words, his statement of relative safety is based on the assumption both 120v/12v installations are done correctly but then considering what can go wrong afterwards.
Any feedback from experienced pool electricians? Does this make sense?