If you are just doing just one plant, you could get the 200w 6400k bulb (same shape, but a little bigger, more tubes) and switch the bulb for flower. I used to do that for 4 plants. Worked well.
Now I switch to a 150w hps. Light penetrates just a little deeper than the CFL. Comes out to 40% more lumens. And I'm doing only 3 plants (3 diff strains).