I got two huge 8 inch 27ks that use 68 watts each and four 23 watts and am using fox farms soil and fox farms grow big during veg and am using advanced nutrients bloom for flowering and the big one is 19 inch's from soil to top and the others are 10 inch's.there in a big box i build out of plywood and it has a intake fan and exhaust fan with light traps i made.the temp in the box is 75 degrees when lights on and around 55 to 60 when lights are off.i didn't top them ether maybe next time but thanks guys i will post more pics in a few week !!!!