closet questions

so Someone Who Is Definitely NOT Me is planning on starting a new closet grow once he moves into his house. because of medical limits, he is going to grow 6 plants and was planning on either a coco grow or a first time DWC. the closet is roughly 2' by 4' by 7-8' tall +- 3-6 inches in either direction he is guessing (hasnt seen closet yet). he was thinking of doing a tupperware tub DWC if he decided on hydro.

here are the questions.

as of now, SWIDNM has a 600W eurosystems HPS that he is using for a 50" by 35" area. would it be worth it for him to either sell the 600 and buy a 400 or fork up the cash for a 400 on the side in order to reduce power costs and heat? basically what he wants to know is, will the 600 provide THAT much extra advantage over the 400 in this size space?

the main worry he has is heat. a DWC would definitely not tolerate high temps in a closet if a dwc is what he decides on... he plans to get a 200-400 cfm inline fan and take the closet door off and replace with ply wood that he can cut holes in. what would be the most efficient way to set up this fan to cool the whole space as well as the light? his hood has adapters for hooking up tubing to the sides. SWIDNM was thinking he would cut a hole in the bottom left of the plywood, then another in the top right. hed have the fan suck air OUT of the room (?) through the top hole, and tubing would run from the top hole to one end of the light so air would be sucked through the light. would this be the best way?

what do you guys think he should do?
 
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