The UV-A is very powerful. And you'll find mixed opinions on it
I did notice a sharp increase in resin and trichomes with my autos were out out this world mixed auto strain diary
I talk in depth as I said in all aspects of this light. Feel free to mes me for a semi guide when to use.
But, they really are a gift for fems. They speed up the time it takes to flip into pre flower from 10-14 days to 4-7 days i see pistils (stigmata) days after I switch to a 13/11 on/off for pre flower. And for fattening you can do a 14/10 on/off but with autos. You don't need it, as you will reach your DLI within the 18hr window. But with fems. It adds extra DLI by like 20%. Amazing when you fully grasp how to use it.