mini grow room!!

Whats up guys?
My friend has this old subwoofer box that 32 inch tall, 16 inch wide and 14 inches deeep. right now in the box he created a door to it so no light ecspaces. he has a 150 watt Floralux HPS mini grow light at the top of the box (prefer a better light? light that is energy efficient yet can supply one plant through all stages?) with 2 mini fans insterted in the sides of the box, one at the top is for the hot air to be blown out which is hooked up to a homemade carbon filter for the odor. the second fan is in the middle of the plant which is to blow air on the plant (what could i do for better circulation?) .

he hasnt started growing yet because he is still unsure about his grow box like what he can still do to make it better? what he still HAS to do for good plant growth.

please leave comments and advice all is appreciated thanks!
 
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