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I’m your huckleberry. It all depends on how high they are mounted. I personally run mine at full strength and just mount them 3-4’ above my seedlings. But I use 1k watt MH so it’s different. I would say if you are under 20” or so then reduce power(assuming your temps are in check) anything above that rock it out at full powerI have not grown with MH so I can not answer that question. I can barley handle the heat from LEDs. I think a lot of HID growers start their plants under fluorescent? I am trying to think of who grows MH. I rarely do this but lets get some help answering this question. How about it @Gladiators We need an experienced HID MH grower answer this seedling question.