I was using about 3 to one when I used cfls (3 2700k to 1 5000k).
www.1000bulbs.com has 105w cfls for twenty bucks which is the largest wattage you can fit in a standard sized socket (in America). They toss out about 7,000 lumens - not bad for twenty bucks. I used one per auto moving them around giving each a couple days under the 5000k temp bulb. This was one of my first AF set ups. It worked pretty well.