QBs are LEDs. Its just a fancy name for led diodes on a PCB board that was popularized by HLG. The tech has been around forever. The difference with time is that newer and newer diodes are being pushed out, with greater efficiency, better spectrum?, less heat etc. With that, light builders rush to find appropriate drivers, heatsinks, lenses etc to fit the new diodes in order to maximize their potential for growing dank buds. Its as simple as that. Once you get pass all the fancy names and brands, it'll all make better sense and you will never look at a $500++ or even $1000++ and above light the same again, as you have a good idea how much they REALLY cost!
Ready built units are priced higher. I've seen UK growers very happy with diyled as they can custom build a whole light for you at reasonable prices. Google them. I'm sure such vendors are mushrooming all around. I think Chilled is on AFN? And another that also uses Samsung diodes but I can't remember the name. I guess these ppl are addicted to building lights. If you know how to communicate with Chinese vendors (Yes they speak English but its really their own version of English), that will be best bang for buck as you get it from source.
Hope you don't become a hopeless light addict like me!
My UVB MH lights just arrived so I can give the girls a few days UVB before chopping them. Real test will be in 2019 when i start a new grow!
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