Use the uv a the same as your normal lighting. The sun does not have a bloom and veg function or uv on or off. So run normal hours as other lights. Good luck and happy growing 🌱🌱🌱
Definitely best for flowering, but I have heard people say they use them for a few hours each day too. I run 2 TS1000 and a Growers Choice CMH 500watt with 3kR bulb. I don't really look into UV to much honestly. Sorry I couldn't tell you more.