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Lighting questions and help please

Trying to figure out my lighting situation for my grow room im building.. I currently have 3x 600 watt HPS lights for flowering (how many plants should I safely run with that? Wanting to keep them UNDER 5/6 feet at full height so will flip once they hit around 2/2.5ft....

(was going to use only HPS for flower and T5 for seedlings/veg) I was trying to figure out how many plants can fit well under 1 HO T5 so i can go about knowing how many ill need to run the veg area. any help would be amazing. Thanks.
 
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