LED light & Tent size Mars Hydro LED

Hello everybody, I am new to growing cannabis an would like some more information on some specific topics dealing with tents and LED lights. My concern is having the tent size being perfect for a Mars Hydro 600w LED as I have done countless research to find this is the best LED light for the money I am going to be spending. I ordered a 4x4 grow tent but am now thinking that will be too big for just the one Mars Hydro 600w this's is the old version light as well but I know still does very well. I want to grow 4-6 plants in soil for my first grow. This seems to be an ideal set up but just want to know if a 3x3 tent will make more sense. I really just want the best overall yield for first grow, I will also be putting the tent up in my bedroom it will be a more discrete grow. Please any information will help I have more questions but will put in a different post.