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Honestly, I'm guessing 200w of CFL's in a small space put out as much heat as a 250w HPS. I say this because in my opinion I look at CFL's as heating coils. I mean there's air constantly moving through the CFL bulb and so it just heats up the air more efficiently than a single bulb(like an HPS). It's easier to deal with heat when you have only one bulb instead of like 8.
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