For instance I would run 12 in a 5x5 area. I probably don't have as much experience as some these guy I've only been growing a year started with a second hand 70x70 tent an a few house led bulbs. Then got a ebay special dual spec cfl 300w thing . Turned a 400w hps on once then give away. Now I kinda just do my own thing tbh this is my life so my grow area is my lab