How many plants under a 400 watt hps?????

Im new to this site and to indoor growing. I have pleanty experiance for outdoor growing but from my under standing indoor is a little trickier. My ? is i have built a 4x4x7 feet tall grow box i plan on doing a lst/scrog for the size of the space but how many plants can i grow under a 400 watt hps/mh in a 4x4 area without the buds thining out? I have a 6 in inline fan w/ cabon filter for ventilation. Walls are lined with mylar? any tips are appreciated like i said im new to the whole indoor thing but not new to growing.

I think you'll be okay with a 400w in that area. I have a 1000 watt I use in the same area and I have incredibly dense foliage and buds. If worse comes to worse add some CFL supplemental lighting. Goodluck!

nine33 said:

I think you'll be okay with a 400w in that area. I have a 1000 watt I use in the same area and I have incredibly dense foliage and buds. If worse comes to worse add some CFL supplemental lighting. Goodluck!

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I believe you can do a max of 12 plants under a 400w. Good luck!

I have done 24 under a 400 watt hps in a scrog siruation in a 4x4 area.

Since a 400 watt HPS is better suited to shorter plants I do a SOG with 25 clones.

I might try to squeeze in 6 rows of 6 in my 4 x 4 space sometime when I get more clones going.

But first iam setting a baseline for how much I can get outta my 400 watter this way.

I got a 1/2 pound last crop.