I don't know why they would put a osram graph up and not use them!
@Spectrum KIng LED 's web site has a similar "LED 101" page which appears to be designed to imply they're using the best LEDs when they're not. In similar fashion, HGL probably uses an Osram chart because they can't find one for the epi-whatever chips they use?
As self-promoting as HydroGrowLED is (and Cammie McKenzie's reputation for promoting her interests in disreputable ways), I see the "LED Basics" page as simply that: not specific to their product. If it was specific to their product, don't you think they'd say which diodes they use on their *product* page?
At the end of the "LED Basics" page, all they say is:
Hydro Grow has found time after time that the most efficient 5W LED can be matched in output by a competing 3W at 33% less power consumption. Companies selling LED Grow Lights with 5W LEDs are preying on the uneducated consumer who doesn't realize that more power consumed doesn't equate to more light output with 5W LED Grow Lights. It is for this reason Hydro Grow uses 3W LEDs in all X-PRO LED Grow Lights to ensure the highest output with the least power consumed.
That's the complaint people have about Kind, Lush, BlackDog, HydroGrowLED. As the "LED Basics" page points out: expensive lights tend to use top-bin Osrams, et. al. But, those expensive lights can't be assumed to use them because, if they did, they'd certainly advertise that fact to justify their expense. Instead, they imply it through commentary somewhat removed from the product pages where it would have to be more factual.
That's what SpectrumKingLED does. They have a "LED 101" page which says it's to describe what "sets their light apart." It then talks in generalities about the best individual LEDs versus the worst COBs, concluding COBs are a "myth." But, they use diodes that are a couple generations old, far from the 200% performance edge they imply they have.
You could ask the same question: Why does SpectrumKingLED compare COBs to the best individual LEDs if they don't use them? The answer should be obvious, right? It's not a very attractive answer. People gotta sell lights and make a profit. Why would you spend $1000 on Cree XB-Ds when you can get XT-Es for the same money? You can buy 400w of XB-D light in the form of 42 Cree A19 lightbulbs at Home Depot for $300. It's hardly anything special. But, that "101" page makes the uninformed go ga-ga over what they
want to believe.
To their credit they use Cree, it's just that they use Kind/Lush/HGL tactics to make themselves look better than they are. Kind, Lush and HGL are expected to use epistar/epiled because they won't say what they use. If they'll go to the levels of that "LED Basics" page to imply what thy use, why wouldn't they say it on their product page?