@backyardpizza, according to the Maxsisun user manual 16”-20” is appropriate for flowering. I’m at 13” with my closest flower which is why I dimmed a bit to 90%. I probably could go down to 80% honestly. If you haven’t I’d suggest downloading the Photone app. It’s not going to be as good as an actual PAR meter but at least it could help you ball park how much light you’re getting on your plants. Good luck!
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