Plenty of growers have used CFLs throughout their entire grow and have yielded decent amounts. Like the guy above me says, it just depends on what you are wanting to get out of the grow. If you are just growing a plant or two for your personal stash, then 4-8 CFLs probably will do the job. But if you are looking to grow anything more than that, I would say invest in an HPS if possible.

With my current situation, I am not able to have an HPS, so I'm using CFLs throughout the entire grow.

Experiment and see how it works out. If you don't like the growth you're getting from CFLs, you can always upgrade to an HPS.