where are you coming up with this dude?
There's no way you can produce 20,000 lumens from 130watts of cfl. Heck, you can't even do it with 200w cfl. Go ahead, prove me wrong. I mean, try to prove me wrong.
I don't see why your plant stretched just because you weren't watching it. Do you have a sun-like glow that helps your plants grow better or something?
Additional costs to cool? It doesn't cost me anything extra to cool, aside from the extra length of ducting I bought at $10 to connect the exhaust fan I would need anyway (to get fresh air to the plants), and hook it up to my hood. In fact I only needed to do this for 600w HPS and above. 400w doesn't really need any extra cooling, aside from normal intake/exhaust which you need anyway. Anyhow, my fan only uses 60w, which is about 5% of my total power consumption for a small tent.
Not sure how you think the bulb is gonna last longer. CFLs are rated for 10,000 hours. HPS is rated for 24,000 to 40,000 hours depending on the specific lamp.
Oh, you are right about one thing -- you do need a hood and ballast. The hood and ballast for a standard 600w system is around $200, so there is some up front investment. However a god investment should last around 10 years. That investment only costs $20 a year. The total investment is $.33/watt. Look on craigslist, and you can get a setup for under $100. There is also investment in cfl however. You are going to need a clamp light or something of the sort, which will cost around $8 for every 55w cfl, plus random extension cords and stuff, not to mention the cfl itself. It's around $12 per cfl/light/cordset I'm guessing total. So your investment for the 3 cfls is prolly around $36 for 155 watts. That's $.23/watt for the investment. I guess you got me beat there. Congrats on saving $.10/w on the investment. Unfortunately you'll be blowing that savings real quick every month due to the low efficiency of cfl.
You can put a cfl wherever you want "without worry", but I don't have to, because I have one big light that covers all my plants with a strong sun-like intensity with a full light spectrum.
I think I just ended the argument.