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Do MHs and chillers go hand in hand?


Trailermann
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I managed to run a 120 with two 400 watt MHs in a canopy without a chiller... BUT, I had a lot of fans running in the canopy and sump to accomplish that.  Sounded like a jet runway in my dinning room.  Tank still got to the upper end of what I considered safe and, as you can imagine, evaporated a lot of water.  It is probably more feasible if you use pendant style lighting a reasonable distance from the water surface as the heat will not be as contained.  You can also reduce the heat load by using external return pumps etc. if you want to capture some additional headroom.

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