Yeah, 60 plants at 2 months old, that's a lot of space. Figure about a square foot per plant if you pack em in pretty tight, and that's a 6' x 10' area. Basically, you'll need one small room to hold that many plants, and you'll need a lot of lights, and good ventilation. Could probably get by with four 600 watt MH lights, but four 1k MH lights would cover that area better. Not sure flouros or CFLs would work all that great for covering basically an entire room. Either way, you're gonna get a lot of heat buildup, so ventilation will be very important.