Zem beat me to it. I would have advised pretty much like he has. With what you are working with, his suggestions to flower clones while small may need with some success. You will still need to make your space way smaller though. You have light for a space about 24" x 18".
When you get right down to it, wattage really doesn't matter as different types of lighting put out differing amounts of lumens per watt. It is lumens that matter (generally speaking). Unfortunately, CFLs put out the least amount of lumens per watt of any lights we use, making them the least efficient. When you get enough of them, you have to have dozens of them and they put out a lot of heat when you get as many as you really need in there. That space probably requires at least a 600W HPS.
In addition, you still are probably not going to have enough headroom. Most plants will at least double in height, even plants that do not stretch much will gain another 50% of height, some grow 3 times as tall. However, do you even know the sex of this plant? Have you seen preflowers? Do you know the difference between a female, a male, and a hermy?