i have 60 plants "Big bang" using 20 liters containers,1:1:1/4-soil,dung and perlite,the dung haveN-250g/l,P300g/l,K400g/L,the soil is from my garden outside,my lamps is a 3-HPSx400w,1MHLx400w the light is a 60santimeters far from the plants,temperature is a 19C night 25 day,the fan is a 40watts...