Ensure your shoplights (T8's) are within 2-3 inches of the plant tips, with a small fan in their, they breathe too, hang from chains adjust daily, the 2 footers are junk the best lumen per watt is the cheaper 4 footers, ensure you have a balance of cool white and warm white, once you flick to 12x12 go 100% warm whites, consider removing all that leaves below the canopy that the light don't reach? ..I grew with T8's for years back in the 70's ..lol best it to make your own bank of 6-8 light on a board 4 foot long, thats a grow light ..lol
thanks.i have the 4ft lights four of them it is bright they work out great i have a fan on them to. i was thinking about growing 50 small plants. about 2_3 ft tall. rather then grow a few big plants.