Well, if I may offer a humble opinion...

I have seen some people do amazing grows with CFLs, though they generally have to be placed way closer to the plant canopy than MH or HPS.

Your veg state should use 6500k to 4100k bulbs, with higher colour 'temperature' (being closer to the blue end) preferred...

Your bud/flower state should use as many 2700k as you can cram in there, but having 6500/5000/4100k bulbs /with/ the 2700k 'warm white' will not hurt, and might help.

For reference, check around some of the flourescent manufacturers' websites. Most of the ones I found that showed the spectrae of the bulbs in question showed that 4100k or 6500k usually have a good hit in the blue end, and 2700k better in the red. Using all of 'em might get you something that the plants like a /lot/. But they need light nearer the red end when flowering, hence the addition of 2700k or 3000k...

More light is usually not a Bad Thing, unless you're somehow getting to like more than 14,000 lumens / sq.ft. Then you're overdoing it

Hope this helps!
(c)C :chainsaw: