How much weight can hydro produce?

10 plants under 1000 watt that too little light you need atleast maybe 400 watt or less.
 
A 1k light will effectively illuminate 20 sq/ft., such as 4' x 5'.

P.S. there is no way to give an estimate of yield.
You don't know if any are gonna herm. on you.
You didn't say how long you intended to veg them.
Or if you have excellent flo-thru ventilation, or if you can keep the ppm's & pH optimized.
Insect infestations can also impact yield.

Keeping everything perfect, you may yield as much as 1 gram of bud per watt of HPS.
 
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