The science does not support increased THCa or CBDa with UV supplementation but terpene production can be enhanced.There's also a couple different spectrums of uv. @Mañ'O'Green runs a few different ones and he knows the details. I just see nothing from the added UVA. UVB could be a different story. My bar hangs down through the middle of my light. No real difference in the plants underneath it compared to the edges. Been through a few grows with it now
View attachment 1687212
I was damn near bitten by a goose this morning