Hi: I have a 20 amp circuit for lighting and want to use 24 recessed fixtures with no more than 75 watt light bulbs so I never plan on exceeding 1800 watts. I already have 150w rated fixtures. Wondering if you think that's OK or if I need to use fixtures rated just for 75 watts? It's for a music practice room in a metal building separate from the house. I can always write inside the can "do not exceed 75 watts". It's at a place where I live and plan on staying forever so it's not like I would plan on selling some day.