When using tube floros like that its best to keep the lamps like 1/4 inch above the growtip,if the upper fans grow into the lamps no harm done just bend them down a skosh.Baby clones and seedlings lone flourescent light,but they lose their effectiveness at a couple inches.Also when the plant gets 6-8 inches in height tube flo's just become ineffective you really need more wattage at that point.You can start 10 beautiful seedlings or newly rooted clones with a simple 4 ft 2 lamp flourescent,but keep the lamps virtually on top of the plants for best results.