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    400w hps in a 24inch x 24 inch grow tent? Heat manageable?

    I couldn't cool a 400 watt 3x3 with a 200 cfm fan at intake and exhaust (2 fans) in an air-conditioned room! A 250 in a 2x2 gives you roughly 62 watts per SF...is more wattage better or really necessary?
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