This is exactly what I do. I've got a 4 way splitter at the top of my tent and then I can have 4 drop lightsCFL bulbs should be as close as possible to the plants - more than a few inches and your plants get very little of the light. So, you can supplement your main light but if you mount them too far away, it is a waste. Instead of mounting them, you can just hang extension cords with plug-in sockets so you can move them around as needed, filling in areas of thicker growth.
Thats what I plan on doing as well, thanx guys.This is exactly what I do. I've got a 4 way splitter at the top of my tent and then I can have 4 drop lights