need expericened advie pleas

ok so i have grown two set set of four plants before lowryde ak74 i got a very poor yield but the smoke was great and i wasnt in it for the money.

now things have changed i want to grow big bud and i am aiming for around a kilo (36 os) of dried bud in the end so my questions is roughly as i no a exact awnser cant be how many should i plant and i have already decided to use 400ww lights as i can aqquire the cheap so how many lights should i use any genuine feed back would be appreciated thankyou for reading
and smoke on !

You can't get there with that plan!,,,,

10 lights and 60 plants...if you fuck it up enough you'll only get a kilo...

thank you do you no what was wrong with the plan ?
and with 4 400ww lights how many plants could be grown

what is wrong with it if you could explain.

10 max and no key mate. not with 400w

what watt would you recomennd ?
and how many of them as i have a large well ventilated and secure area to plant so i can aim big lol

medium nutes room size ventilation we will need more info mate, sorry.