Im using 2 6500k 75 w CFLs and 1 75 w 2800K and having really good bushy results..
I have never even topped this plant, I keep a fan on blowing up at the bulbs, and keep my plant about a fingertip away from the bulbs..
Here is a nice shot of the lower branches.. They have since grown in much longer
The plant is about 1 month old, and about 3.5 or so inches tall..
It was in high pH soil for the first few days it poped up, which Im sure stunted its growth abit..
However now its really starting to "size up" thankfully..
Still bulb distance is quite important to stop it from stretching, and the less stretching it does then the sooner other nodes will be able to branch themselves..
I have noticed the smaller lower nodes that are branching on mine, are also starting to show early signs of new growth already!