I have 4 X 250W MH and 4 X 54W T5 inside of a canopy on my 180G.
I have a controller to turn on fans at a certain temp (79.5°), then to start shutting off lighting if the temps get too high (82.5° for 2 X MH, 83° for 2 X MH and 85° for the T5's). Rarely do I see it turning off the lights, tank usually hits a high of 82°.
I do have central air in the summer as well to help.
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Getten Outta Dodge
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