600 grow box help

In the process of setting up a 600 watt indoor grow. Just have a question about the box, what size box (dimensions) is considered to be most efficient if im going to be doing 6 plants under 600. Dont know if this would matter in the design process of the box, but i will be using a Lumatek digital ballast with a air cooled reflector. Or, maybe 6 plants isnt even the most efficient number of plants to be doing under 600, im open to all suggestions. Growing in basement, only have about 6.5ft of ceiling clearance.

souds good to me .. atlest you got the cool reflector .. and 6 plants seems ok .. I do 4 under my 600W cool hood

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I would say minimum 3x3 feet and sealing hight .. tho if you can .. make it 4x4 so it don't get to crowded in there ..

here is a chart of HPS light and distance:

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I usealy keep mine 20 Inch`s over my canopy and let em grow up to 15"

Its a pretty open basement, just not that tall. I could definitely do 4x4. How much you yielding with 4 on average?

2-4 oz per plant .. depending on strain aso.

and yea 4x4 and atlest 5+ in hight if you want enough hight for 2-3 feet plants plus light and distance from it ..