Ah cool man in the setup i use to use ( now i try outdoors and only veg inside )
I was using 4 30w cfls and 2 60cm long flourescent tubes.
My girls normally doubled so with a cfl...mine kinda changed over time and ended up to be that for 2 or so plants they normally doubled. or atleast in between double/trebled. I always tied the plants down though towards the end, like the colas in certain direction for exposure to light etc...
Look real nice and healthy man!