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Old 09/10/2007, 04:58 PM
sirjohn sirjohn is offline
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Join Date: Apr 2002
Location: miami, fl
Posts: 311
I will not profess to know as much on this topic as others because I simply have not researched it enough, so I speak only from my own personal experience. And within that realm of experience, with T5s I could control my temperature in the tropical heat of Miami using fans and no chiller, while with MHs I couldn't dream of doing that.

While it may be true that T5s put out as much heat as MHs, in my experience they heated the water less. I don't know why that is, but I'm guessing it may be because in a 36" bulb the heat is spread out along the length of the bulb and is largely diffused by running fans along the length of the bulb (as I do), while a MH acts as a pinpoint source of heat, which is much harder to dissipate with just fans and no chiller.

They both likely use the same amount of electricity, but the difference is that if you can avoid using a chiller, you will undoubtedly save electricity.
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