The bestva 2000w led is around the same efficiency as about 360 watts of hps lighting. At a hanging height of 24 inchs the coverage area for that fixture, for flower would be closer to a 1.0 m x 0.8m space.
For the Viparspectra 600w, it's akin to a 250w hps, core footprint at 24" is about 0.6 m...