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Actually ordered the HLG 600 from them myself on the 12th, still waiting for it to ship though. Got a canned response about 7-9 day lead time which I was good with. Day 13 now so getting a little impatient. Ordering the unassembled one will probably ship faster which I meant to do but when I...

This post from the other day i think will answer your questions. https://www.rollitup.org/t/hlg-quantum-board-question.983085/

I was also just wondering the same about these 2 and also just ordered the 600. Besides the driver being a B, where the 550 is an A, it looks like the 600 is stronger and can dim down lower. 550 has a 3 yr warranty vs 1yr on the 600. To me the 600 was a better buy and being cheaper is a plus...

I am thinking about just grabbing a CMH myself. First time growing. 4x4 tent. Have a 600 viparspectra but I don’t feel it’ll be enough for flower. I’ve read so many threads about QBs I’d like to go that route but am so confused. The more I read the more I think I understand until I try to price...