In my opinion, it's doesn't really matter than much during the first 1-2 weeks (1 week for some fast starters). I noticed that I'd said mine were 100 w CFLs...well after thinking about it, I believe they're more like 40-60w bulbs..lol. I've never used full spectrum cfls, but I don't see why they wouldn't be okay for that initial week or 2. For my past few grows, I've tried to start with the CFLs until they look like they can handle the bigger light, then I start the big light, raised all the way up as high as it will go in the tent, and leave the CFLs low and close for the next week or so again - this seems to 'ease' them into the big light better, and keeps them short at the same time with the close cfls... I'm running 24 hr lighting still at this point too, so I just leav me tent door open enough to help it stay cooler in there for the tender seedlings. Once my lights are all ducted and the fans are cooling things properly, I can close the tent up and start 18/6 lighting for the rest of veg...