Timber and hlg both sell assembled lights, no worries there. How big of space are you flowering?
The spectrum king for whatever reason seems a little high on the cost per umol level. Probably the highest of any. The cooling they have is cool, and is probably worth something to most people. So you have to consider that. In my opinion, other than cost they’re downfall is packing all of the leds into such a tight package. Which means running it high to get a decent spread. Can be an issue depending on what you’re trying to do.
Fluence is good too, but again high on that cost per umol level. Not as high as spectrum king though. Their vypr package is a little more spread out, but kind of runs into the long and narrow category. If you like to scrog, that would mean your net kind of has to follow that footprint. May or may not be an issue for you. It may be something that works out for you.
Horticulture lighting groups quantum boards use mid power tech just like fluence and spectrum king. The other two aren’t as sharing on the exact diode, hlg uses the Samsung 561c top bin. Which for quite a while was the most efficient diode available. The new samsung I think lm 301b is maybe a couple percent better, and I believe Cree and osram are releasing one competitive with the new Samsung. But I’m not aware of any grow lights using them. Anyway, the hlg-550 retails for $1050 and third party tested to meet or exceed single ended par levels of se 1000 watt hps. Efficiency wise and par levels are almost identical to vyprx plus from fluence. The one advantage the hlg-550 would have for most is that it’s more of a square fixture you can get an even spread out of without running with a lot of height. There’s usually some sales and such you can get 20% off as well, which makes it competitive at every level.
Timber grow lights builds cob fixtures. They have variety of sizes to fit just about every grow, and offer them all in cree, citizen, and bridgelux cobs. They have a somewhat diy appearance, but they are built well and have a really good reputation. They also give you pretty accurate par data, so should be pretty easy to compare price vs performance with the bigger names.
Another option may be a pic-6 from pacific light concepts. Although they are seemingly always out of stock. It’s a 6 cob fixture that’s also third party tested to meet 1000 watt hps par levels in a 4x4. Price on that one is $800, but you’d probably have to send an email or something to see if any are available.
Long story short, I think they’ll all grow pretty good weed. For price alone, I personally would probably rule out the spectrum king. But that’s just me. The others all have some high and low points. Maybe take a look at those couple of lights and see what you think.