No not at all....you misunderstood... ALL the things you're saying is right. I do run intake/exhaust..and Co2.. and other lighting...BUT this grow was only to showcase something different ( refer to the beginning of the thread). There are people running fully dialed in systems and only pulling a zip off an 8 inch clone... BUT I pull 2+ with nothing basically...oh and such outdated lights...lol... As far as distance...you should do a little more research... there's no way you put a lush light, blackdog, Kind...or any of these "outdated" fixtures at 20 inches.. they'll taco right up...swear. BUT maybe your LEDs.. Happy Grows!