put it this way. im also in a 4x4.
thats the 1200W version.
I have the
viparspectra 2000W version AND another 600w smaller one beside it. while it did do good, there was still TONS of room for improvement and potential in the tent. 4x4 is kinda big.
so I upgraded it significantly to the kingbrite 480W for $660CAD shipped off alibaba in my 4x4 and could almost squeeze even a second one in there im thinking!! its a solid light (and even some could say I cheaped out... but damn. $2000 for a light?? where do you draw the line? how high are your standards? how much of a perfectionist are you? how high are you?)
"enough coverage" is very hard to say, all depends what your standards are.
but if you look at the ppfd numbers of that light at the 4x4 square its pretty damn low.... it will grow buds though so....
lighting is EXPENSIVE but not only pays for itself in bud, but if that $1000 light doesnt pan out or whatever.. its worth $800 cash tonight on craigslist so you can always get most of your money back is the way I looked at justifying an expensive light. plus some wicked yields along the way. it just sucks to pay that initial cost.
I know its easier said than to go buy a $500 light but just some food for thought. my setup already cost me $1000+ so to cheap out $2-300 on the light just didnt make sense for me.