2700k is great for flowering. 6500k is great for vegging. The in-between kelvins (light spectrums), like 4100k, etc, are less good for either, but probably work pretty well if you're not going to be changing bulbs. At least I hope they do, because I just bought a couple of these to throw on a spare female Sativa-dominant plant I have had laying around since April or May:

http://www.1000bulbs.com/product.php?product=31681

BTW, just forget the 'equivalent watts' bullshit; that's purely a marketing thing, and has zero bearing on how the lights work with plants. It just confuses matters. All that plants care about are lumens and spectrum, and all your electric bill cares about are real watts. Unless you're growing humans, of course; they might care about equivalent watts I guess.
jamstigator Reviewed by jamstigator on . 2700K GE Soft White CFLs for Flower? The 2700K sounds right but I've read posts that said not to use soft whites. I hope it's OK to use them because that's all I can get locally and they happen to be on sale. I can get six 100 watt equivalents for under $16. Rating: 5