The specs on there says it only covers 4x4 in flower so it does the job a 5x5 alone? Never used bar light, I used the 2 SF-2000 last run through flower with 6 plants with ok results but only used the 5x5 in the last couple weeks bumped up from a 3x4 so the plants were not quite as wide.You'll want at least 30 watts per square foot (Minimum light requirement in a 5 x 5 would be 750 watts during flower). My four quantum boards comes out to 960 watts or 38.40 watts per ft square. All my boards have dimmers. I've been happy with the results.I like the light spread using my 4 boards.
However, I'm running this light in my other 5 x 5: https://www.horizenhydroponics.com/grower-s-choice-roi-e720-led Due to the bar light design I get very similar results with it while using less energy.