Fluorescents, compact (CFL) or not (tube ie. T-5) are great for vegging...
But when you start talking about flowering... they work, but are not the best option...
What we (I) are trying to achieve is growing our own buds, hopefully cheaper than buying it right????
Ok, so you need to consider the Gram/Watt ratio of your grow....
The very best indoor Wizzards are getting well over 1 gram per watt...
That means that if you have a 600 Watt Hps, and you fill your area to capacity, with everything perfect, it is possible to get 600 Grams/21.1Oz....
Try growing with 1 80 watt CFL and you will soon realize that you will not harvest 80 grams...
The best way to improve that ratio is to use a powerful HPS...
2 x 250 Watt HPS does NOT have the same INTENSITY as a single 400 Watt HPS... they may cover a larger area, but the light PENETRATION is still decreased...
I hope I am making sense, but basically anything shy of 400 watts (on HPS) will give you the low intensity of a cloudy day...
We are the weather indoors, why make cloudy days everyday..?????
If you stick with growing, you will end up with a 600 or even a 1000 HPS, why upgrade 15 times along the way...
Even economically it makes sense, it is the one tool that will the biggest impact on your harvest, bringing you closer to that elusive 1 gram per watt ...
I hope I didn't sound like a dick, I'm high and I just hate to see you buy and replace unnecessary equipment... it's expensive and puts even more trash out there...
Buy what you need... once... it's cheaper and you become a "better grower" quicker...
Just my thoughts man.. go with what you know...
Best of luck...
Gypsy...