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I have never used HPS, but i would think 6' is enough for only a 150 watt bulb.
I wouldn't bother with PC fans. I run 286 watts of CFL's from 13 watters, to a 130 watt, and I need 3 fans pumping to keep it cool.
I was also thinking about just running a 150 watt HPS and a few of my CFLs. In the end I will probably just buy the 250 watt HPS, though I'm curious as to how these different systems compare.
How does 270 watts of CFL compare to 150 watt HPS? and to a 250 watt HPS?
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