How To Use Progressive Web App aka PWA On 420 Magazine Forum
Note: This feature may not be available in some browsers.
Go big or go home I'd go with the 700...
of the 2 options, definitely the Mars II 700
But I do know Murphy, and his law. Things break, so I'd take two good lights over one big light.
keep in mind before i answer that I am using HID and have never run LED lights, my input is based solely on personal research and what I have seen around the forum;
lighting is a big decision and investment so you're going to want the right unit for the job - the 900 theoretically will cover your 3'3 canopy with a bit of light to spare, but i cant say how much it will penetrate the undergrowth without some kind of training. (LST, SCROG)
check out other peoples grow journals and compare their results with different lights and tents as well;
you can post a question for Sara, the Mars Hydro rep here
Mars-Hydro LED Grow Light Discussion
here is a member using the 900 in a 4x4 tent - which suggests the 900 would be adequate
Mars2 900 - 4x4 - Scrog
further discussion on various Mars lights
MARS LED Lighting Choices