I've been through this a few times before...I have tried many different light combos and I am becoming somewhat of a expert on CFL's lol
You need the Blueish(6500K) for vegging...and 2700k for flowering
if you use the 2700k for vegging, your plants will not be bushy like you want and they will stretch like crazy...I call them scarecrow plants
If you use 6500K for flowering, youre plants buds will be smaller and you will be able to see through them they will be so sickly. and they will take FOREVER to flower unless you have liek 400 watts of cfls ( a shit ton of 23's) and a lot of heat for 42watts+ bulbs.
I've spent liek 40 bucks and I think Ill get about an ounce off of a plant thats like barely a foot tall and has 3 colas from cutting the top 4 weeks into vegging.
Make sure you follow the correct type of light need for your phase, I have tried every way around these kind of things because I'm cheap as hell and they don't sell big names liek Fox farm and HPS lights where I'm from.....
YOU WILL BE DISSAPOINTED AT YOUR PLANT WITH BLUE LIGHTS FOR FLOWERING I PROMISE YOU... you'll have grown for 4 months for an eighth of leafy bud with whitish hairs that arent all the way developed.
At walmart, they sell GE 42 watt bulbs in red and yellow box's, you can see the big ass bulb in the box...those are 99.9% of the time 2700k(reddish light, for flower)
I have 4 of them and they cost me 8.50 a piece and I took lamps apart at my house and use the cords and sockets only from the lamps to hang them from little 89c hooks I bought from lowes. I can move the light wherever I need to to get the light where it needs to be. I have them set up right now in a 4 points set up and the 5th one is right in the middle with a big reflector on it so It directs a lot of light on the top middle of the plant