I had my CFLs never closer than 4 inches and sometimes as much as 6 inches away, and the nodes on my Jock Horrors (mainly Sativa) are VERY close, too close, they are so bushy, they need more space to allow light. They are only 8 to 9 inches after a little over 4 weeks. On the other hand, the two auto flower strains (Pakistan Ryder and 60 Day Wonder) sat nearly idle for two weeks after sprouting and then suddenly shot up tall with long node space within a few days. They had the same light basically as the JHs, and all are feminized (and no signs yet of Males or hermies). So I would say that genetics are more important, and the idea of close = short node space doesn't seem to be a given from my experience. But, this is my first grow, so I am a newbie through and through