I used UVB the last two weeks of flowering of my first grow with great results and am curious about UVA and if it really helps flower development in any noticeable amount. And what light schedule is best for UVA (if it helps) and UVB during flowering. I will be using UVB again this second grow and don't want to leave out any other beneficial part of the natural light spectrum for flowering. My girls are really loving the spectrum they get from the new HLG Scorpion Diablo lights.
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Good questions. I wrote an article on UV light awhile back which I believe answers your questions: https://www.mrgrowit.com/post/2018/03/28/uv-lighting-for-growing-cannabis