FYI for any other broke CFL growers, if you're looking to maximize your $, buy the 30w bulbs from 1000bulbs.com. At 2000 lumens output, for about $3 a bulb, it's the absolute best $ to lumen ratio amongst their CFL's.
I bought 10 bulbs from them to start my girls on, picked up 10 light sockets from this site for about $.70 since a piece:
Lamp Sockets with Leads
This gives me a total of 20,000 lumens for an overall investment of about $60.
This breaks down to a cost of $.003 per lumen. For comparison, a 400w HPS purchased through htgsupply.com will cost $150.00 after shipping and will provide 50-55,000 lumens. Using 50,000 as the production mark, this breaks down to $.003.
While the HPS is much more cost effective in the long run, providing 2.5 X the output at only 1.33 X the input, the CFL's have the advantage of being extremely customizable in size and cost of the system as well as the placement and color spectrum of each individual bulb.