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hi, this is my first grow. northern lights auto. hydroponics. temp 22 , ph 6.0. i dont have a ppm meter yet but i use sensi grow nutes by the book , slightly less at this stage. two of my bottom leaves got brown spots. any idea what i should do? light is 300w viparspectra, 24" high, as...

Hi, just moved to Spain and got a 80x80x160 grow tent. Planning og growing 1-2 plants. What lighting should I use for this? The guy in the store says max 250w, my friend says minimum 600w.