Distance from 4 flowering plants with QB HLG 600 H V2?

This is one being assembled by my crony in a legal state and licensed. The HLG 600 has four V2 panels and 600 watt driver.

This one is a test to replace 5 HPS lights in a 6 light room. 4 plants in 5 gallon pots.

Thanks and peace bro.