No i dont get 350 - 500 grams in a 3 foot area but my last haul using the same set up in the same about 3.5 x 3.5 foot area with 4 plants (all that will fit) was about 320 grams, which is enough for me because it is all for me and i dont sell. I do two grows a year and thats 600 or so grams...