I'd look at the output of that light vs the Agromax down below to get some more input. Sounds like it may be more powerful.people say 2 hours so i was going to try 1 hour a day but monitor any changes but there already dripping in frost but you always want more lol
I'm always up for trying new things and if it makes my girls stronger its a win win
Timing wise, this article had a few suggestions for how often and how long to run UV.