Have been growing for a couple summers now and always started with clones under 4ft t8 4 bulb fixtures I purchased 2 Apollo 600w ballasts with reflectors and bulbs I have 14 plants from 24-27in tall about 1ft from the light. Put under 18/6 a week ago with ballasts dimmed to 75%. Plan on switching to 12/12 in a week or two. Will have pictures up tomorrow. Hope someone takes notice of my grow and gives me some pointers!