depending on what type of house you have, flat roof or pitched room, it would be much safer to run a sub panel to your roof. my sub panel is a hundred amp. i have everything that has to do with my grow connected to my sub panel. that includes all fans, carbon scrubber, hydro, timers, and ballasts. for me its much easier to disconnect my panel and roll the flex tubing on the walls up and move the whole thing to a new location. the only difficult part is pulling the main wire feed back through. for the size lights your talking about, a fifty amp panel would be plenty. :thumbsup: