Depends on how much heat your lights generate. You may want to go with a 6" setup to safe side it.The VIVOSUN VS1000 is for a 2'x2' flowering coverage area so you would need 4 of them for a 4'x4' grow space.
@nicoman33 That's an odd-sized space. I do have articles with my light recommendations for different size grow spaces. Click this link and then go to the size grow space that you're interested in: https://www.mrgrowit.com/grow-room-and-nutrients
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Depends on how much heat your lights generate. You may want to go with a 6" setup to safe side it. The VIVOSUN VS1000 is for a 2'x2' flowering coverage area so you would need 4 of them for a 4'x4' grow space.
You could squeeze 6 smaller plants in a 4x4.