Top bin high efficiency production COB panels are awesome in commercial settings and are currently the the top end in actual performance(high quality flower biomass yields). A few soon to be on the same fully commercial certification level(ul/etl/ip65+) as the previously mentioned top brands. But didn't want to really mention them until no questions asked they can go anywhere. But if we are talking about truly the best in, they need to be mentioned. They are just simply photon animals, with a conveniently ideal spectrum. Their price is less for better lights than anything offered in top caliber lights. Of course hps is till the lowest startup, but higher efficiency allows less wattage to create the same amount of light and lower heat(substantial in a commercial setting) and savings to accrue while not sacrificing yield/total crop value.
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Before SK's mkr upgrade they were using second bin xbd's. Owner showed the invoice for the chips. So I can only believe they are using second bin mkr's now too unless shown otherwise.
But let's assume the are using top bin mkr 4k's..."H4".
Go the to cree's PCT and compare across the board any cree chips you want
http://pct.cree.com/dt/index.html
SK uses hlg240-36's and runs 8 parallel strings per driver at ~850ma/string a
SK with H4's at that current will hit ~125lm/w.
While the top bin cobs(3070 and 3590) are doing ~160-172lm/w at the base value level 1400ma.
Similar QER(quantum efficiency rating) including sk's monos making lumens comparisons fair.
Long story short...about 25-35% improvement over the SK...for half the cost per watt at the retail level, then being able to DIY for less is where the argument against SK comes from. And like I mentioned, it's unsure about what bins sk uses and could be an even bigger difference.
And at the end of the day for the average joe...they can DIY a light and save even more and get even better performance per their dollar.
SK is good and they work, but there is better and cheaper led's plus hps is still a ahead of SK.