I have an open room but under 2 600's I keep 4 plants per light in 3 gallon buckets and try to limit plant height to 30".
Those are air cooled Blockbuster 6 reflectors with 4 plants each under them ducted in line.
The lamp on the right is a 315 LEC.
I learned my style in a 4x4 tent and just scaled up to the new room. I have since added the 3rd lamp but maybe you can visualize for your space. Hope it helps.
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