I run the Mars Hydro fc-4800 in the 4x4 tent. I feel that is about the perfect size both in wattage (480 watts) and the overall footprint fits the 4x4 tent just right.
For air circulation I have a tower fan in the corner aimed at the walls. This gives enough air movement to make the leaves wiggle a bit but not real hard. Plus a 6 inch fan in the upper corner blowing on the led driver. A 4" AC infinity exhaust setup to remove hot air and humidity. Seems to work well for me. But I’m not an expert. Hehe.
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