Our lights currently include UV-A diodes.
I'm not sure if there are any UV-B diodes on the market. I know you can get UV-B light using the fluorescent reptile lights. There are even a few LED vendors that add UV-B to their panels using the reptile lights.
The UV-A got us the best combination of yield and potency. The UV light stresses plant and the plant responds buy creating a sunscreen. That sunscreen is basically everything we love in cannabis, like flavanoids, terpenes, tricomes, THC and CBD.
Adding UV-B sacrifices a bit of the yield, but can be really good if you are looking to extract oils. We are all about our customers coming up with their own lighting recipes for growing their plants. If extractions is your goal, supplimenting our LED's with UVB could get you great results.