I bought a hot tub that is configured for both voltages so I'm deciding which one to wire for. Would a 120 volt circuit use anymore wattage than a 208/240 circuit? I'm thinking no. If this is true then is 277 volt lighting any more efficient that 120 volt or can you just put more lights on a circuit? Next my manual mentions GFCI protection if you go the 208/240 volt route but doesn't mention it for the 120 volt setup. I personaly don't see a issue with not having a GFCI for my personal hot tub as I don't see the potential for shock with a functioning ground connected. And my code book is 2002. Only requirements I see are a disconnect within site(residential) and a service recept 5-10 feet away for service.