Kind LED price is high ,I run my CREE LED Grow light , it's very bright .ESL-CX LED 9
In comparison to it's competition, it's actually very low.
It puts out higher numbers than many other leds that cost 2x as much. The big boy has a built in timer, customizable spectrum, & you can time the spectrum. E.g. 30 minutes before lights off you can program the reds to get more intense to mimic nature.
I've always liked the Spyder BML's, the Kind K5 1,000 slaughters them at half the cost. & they run crazy cool. Barely a difference from the on temp & off temp.
Most people who are into led's have a favorite. I've read on here the Apache & Area 51 are the only ones some people will consider. I can't say the Kind K51000 is the best numbers wise, but I've seen it spank several other leds. & I think plant specific lighting spectrums are the next big thing.
I ran 2 of my current plants under LED for the last round. Veg & Flower, & i've noticed, that even though my HPS flowers (this round) are larger & harder, some of the strains produced more thc/trichs/resin under LED.
The WW though, did better under the HPS. Much stickier, smellier...a lot of resin production. So I think having the ability to precisely manipulate light spectrums is the future...& Kind is the only company I've noticed doing it.