You are right. I didnt mean CFL. I did mean CLW. Did I mention I was starting to sample.
I think I rember reading that LED grows take a little longer. I think mine are finishing early.
As for when to use the UV. I found some studies that said MJ''s growth and health is unaffected. The studies also said that the higher the UV the higher the THC content of the trichomes. I started using UV as soon as there were buds forming.