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If you are venting to the outside and need a fan, you could position the fan to pull near the outside wall (as long as there is power there, or possibly use a solar solution) to reduce the noise inside the grow tent which could be louder than you'd think do to it being an enclosed space. Also if using that vent to the outside and using solar you could possibly power all the LED's with the solar power as well.
Raspberry Pi: Wall Mounted Calender and Notification Center
Photo Sensor Controlled Outlet (turns on or off at daylight or nightime)
OpenHAB on Raspberry Pi
Mini XY Laser Engraver
Donkey Kong Bartop Arcade Powered By RPi