when they say 500g per square meter they are saying that is the best the breeder has achieved with this plant and thats usually a sog measurement so basically with the right light, room conditions, humidity etc etc... you could possibly achieve this. im not 100% sure but i think this is also with 600 watt bulbs again not sure about that just what i heard but thats the just of it i guess.When they say 500g/m2 in a seed description is that in soil or an average betveen soil and hydro? it just sound a little bit high to be in soil but dont know. Thanks for reply..!