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I’d be up at least 24”. Do you have a light meter? Do you know what intensity you were putting down with the HPS? I’d start at a somewhat lower intensity than you had with HPS. See how the plants respond and go from there.
I use this one...cheap but it gives me #'s to work with...I switched just myself to an se 3000 from a 1000w hps and I cooked my leaves on the first batch at 55,000 lux 18" away @ 100%.......I'm now at 18" away @80% 35,000 lux in its hot spots 31,000 around the edges...Those numbers maybe incorrect it doesn't matter to me it just gives me #'s I can work withI'm 20inchs form tops and the dimmer is on 50% , what do u mean by a light meter and I'm not sure what I was getting from the hps light don't measure them things