26W CFL generally give off around 1700 lumens each x 3 = approx. 5000 lumens.
I used just about the same when I started my grow from seed through veg with out any probs (in a small cabinet). If possible, keep the lights as safely (dont burn the plants) close as possible the plants to ensure not to lose any light, also to help avoid streching (I should have taken my own advise on this one).
You should be fine. Good luck.