120 V vs. 240 V

Circuits are in. I went with 2 double pole 30 amp breakers, used #10 thnn stranded. Each circuit has 4 single outlets each will have one timer and the 1000 watt ballast. All in 3/4 inch conduit. Thanks for the input!
mustang

240 V is def more efficient, its been proven over and over. I have even switched a 450 plus watt CFL BOX and converted the entire thing to 240 works out great.