i believe its not only the lumens, but the spectrum of light.

I am usng cfls for clones/early veg.

I am going to MH for 2 week veg, or basically a couple weeks before flowering.

Going HPS for flowering. I got the upgraded Hortilux for the better spectrum.

CFLs will work, as I have seen it done, but i want bigger buds/faster growth?

I'm a noob too, check out my thread in this forum with my setup.