yep. 2 600w lights will cover 24 plants in 5 gallon (soil) containers very well. Figure you have about 1200/50 = 24sq ft, where 50w/sq ft is the desired goal. Some would go as low as 40w/sq ft, and that would give you a few more. A "5 gallon nursery pot" is really about 4 real gallons, and...