If you’re into a little diy, you can emulate these LEDs for a 4x4 space or in your case a 4x8 space. We used 2 fixtures each, you’d need 4. Theoretically using about 1400w.
Give this a read through.
https://overgrow.com/t/a-total-nubes-diy-led-build/41269
Hope it helps! 
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