you will most likely run out of head room cause they will stretch during flowering and usually end up at least 75% taller than they were when they were in vegetative stage (the stage youre in right now)
as long as temps and air circulation allow which it looks like you may need to def control that asap... you can def add more lights and try to use the different spectrum of cfl's the best you can get for what you have is warm on the 2700k side and thats pretty much the closest thing for cfl's you can get to having a decent "colour" of light to a flowering bulb...
now you can also flower with 6500k cool white bulbs or daytime bulbs and the stretch wont be nearly as much but you will generally have smaller flowers...
i highly suggest visiting the cfl section here on RIU and they will have a plethora of ideas and ways for you to maximize efficiency with what you got...
btw welcome to RIU and good luck and enjoy the grow