Ah I see, that is very good to know! Thank youI can't comment on UV supplementations much myself. Only done it myself a few times and nothing controlled. Reptile bulbs when I died.
My reference to UV LEDs for fixture manufactures was towards their life expectancy. They are significantly lower than more traditional colors likes, whites, blues, reds.
Now days with BPAR(biological PAR...380nm-780nm) starting to be acknowledged equal or more so to standard PAR(400-700nm), manufactures will use the extended range it offers, but very unlikely to step outside of it till something beyond major comes forward to show it worthy.
Based on all available both evidence and technology wise, I think there is that there is more to be gained from the extended BPAR range as a grower from 700-780nm then there is to be gained from 380-400nmn.