How many plants can I grow with 3x1000Watt HPS?

[MadBlooded]

My English is just enough to be able to tell what i want to tell

- title? And what dimensions the grow room must be?

-What is the difference to grow 2 or 4 plants per m2? intuitively 4 plants will give more yield. am i wrong?

-The distance between light source and plants?

-in winter, the cold weather always vent in the room. How can it be controlled and keep it constant at daytime at 27 celcius degree, at night at 20 celcius degree.

thanks a lot in advance, your answer will be appreciated. i really need these questions to be answered.

greetings...

 

[Kalimaki420]

Look up some journals that match what you want to do.

How much plants is up to veg time, you can veg for 8 weeks and get 4-6 plants in 5gal under 1 1000W or 20 in little pots vegt for 2 weeks.
1000W hps is for about 4x4 / 1,2 x 1,2m, distance 1-2´ / 30-60cm.
You need some big exhaust fan like 1500m3/h with filter and speed/temp controller.
Quit pricy in that range.
I grow at nights to keep temps ok in summer or you would need some 12000btu ac.