You have to understand that, that is for a professional setup with like 800ppm CO2. At 6" those things are getting hit with 1200-1500 ppfd. It would fry my plants in my current grow if it were that close. Like I've said I have messaged them several times, and I asked them once what they recommend for my space without C02 and there summary was get a 47" 2i and place it around 12-14 inches. It will cover 7x7 around 700-800 ppfd. Which is honestly at the limit of what plants will even take without C02. You can write these guys and be like" I got a 4x4 grow tent blah blah blah, they will take the time to do the math for you and let you know what you need. No judgement, not even pressure to even buy their product. I dont even own their stuff, but with the service I have got from them... owning one of their lights is like a wet dream of mine lol