I have a Viparspectra VA-1200 "1200w" (264 at wall) in a 4x4.
That light worked fine from seedling until repotting in 5 gal fabric - there just isn't enough spread to the light, so I'm supplementing with three additional "300w" burples.
My upgrade path will probably involve a more powerful DIY setup - re: placement options, coverage per watt, and just more ppfd overall.
IMHO - before you buy, read grow journals and take note of how others with similar setups fare.
I follow almost every 4x4 grow I can find to see if I can find better methods or equipment; even failures - why not learn from others?
Here's mine if you're interested:
I'm finishing a proof of concept micro-grow. I figured if that worked, I'd start investing. (it worked) 48" x 48" x 80" Viparspectra tent - no light leaks noted, easy setup - somehow larger than I thought even though it fits the tape outline... Lights are Chinese boards: 1 - Viparspectra VA...
www.rollitup.org
You can see from my seedling pics that the 1200 will not be enough to finish all 7 plants; hence the additional 300w lights.