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As seasoned growers, you can probably help with a basic question as I prepare to start myself. I have a 4'x4'x7' grow tent and a 600 watt HID light and am thinking of adding another 600 watt HID light. To provide cooling and ventilation, I have a 440cfm exhaust fan. I want to know if there is...

I wondered if you ever got an answer. I have a 4'X4'x7' grow tent (about the same size as the one you set up) and am wondering if a second 600watt light would be too much if I put a second 600 watt light in. I have a 440 cfm exhaust fan to circulate air and cool.