Reading bunch of articles it doesn't seem like anyone knows much. The 30 watts I've got was built into my fixture. (
California lightworks) they say run thru last 3 weeks but I've always run whole flowering cycle. Just has no idea if that was right. My thought was that at the height of summer we get more uv than spring or fall. Was worried that uv might signal plant it is summer rather than closing in on harvest time.
I just hate using methods I don't understand.
I appreciate everyone's input and expieience. I'm going to go with 10% of total light the whole flower. When my flower rooms are finished I think I'll expirement.