to be honest im not sure what the differencei s between that kit and the normal 550. a kit = DIY? also, where did you get the 49$ off figure by DIY on the 600 from?
lastly, good to hear that it was easy. did you have any experience building things, and is there a guide to follow that would lead me in the right direction in terms of learning DIY for this?
I didn't have any experience building this sort of thing until I jumped into the DIY COB world. I built my own set up for half my flower tent. It wasn't very difficult but it took me a while to get my head around matching drivers to cobs ect. Mostly it was just buying aluminium L shape lengths and riveting them together to support the heat sinks. Much the same for the QB DIY set up but a whole lot simpler.
You can check out growmau5s vids on youtube, I'm sure he has some elaborate builds that you can see. But the thread DIY quantum boards should have some information also. There are plenty of folk on here that have built their own COB set ups and some that have built their own QB set ups.
If you look on here
https://growerslights.com/collections/horticulture-lighting-group/products/horticulture-lighting-group-600h-quantum-board-led-kit
and scroll down there is an option which says pre assembled and tested +$49, its automatically set to yes, just click it to no and you save that $49.
I put my 260w kits together, on the HLG site they have a video link showing how to assemble, I think they have one for the 600 kit.
The 260w kits take 5mins to assemble. Really nothing to it, just need some wire strippers and a small screwdriver. The 600 kit will be much the same.
Weirdly the HLG 550 does have the same board efficiency as the 600 but with the 600 your getting a 100w extra, or at least that's how it looks to me.
BTW on that link above it lists exactly what you get with the kit, so you can price up individually from HLG, I really don't think you would save much though. That 600 kit is amazing value for money already. I don't think those kits will stay that price either.