No ...not really...but you will need to reflect that light back to the plants. CLF's throw light in all directions and they don't throw it very far. A few inches at most; compared to HID lights which can penatrate 10-20 inches.

You will need reflectors.
Dutch Pimp Reviewed by Dutch Pimp on . Fluorescent lights vegging Had a thread and no answer :( i got ignored... HERE WE GO AGAIN I WILL NOT GIVE UP! :D Going to use fluorescnet lights to Veg state and was wondering if i needed 10k lumens per square meter. I have read that some people make it with less, but the strongest lights i can get are 240W Daylight(6400K) and a total of 2400 lumens. Wanted to place two of those, which would be 4800lumens. Do i REALLY need to place 5!!!! bulbs to reach the 10k lumens? I read that with 2 bulbs of 35W each is Rating: 5