Am I getting light burn? The led is 20" from ...

hey EZ1, that's whats called "senescence" in plants so basically at the end of their life they kind of stop absorbing nutrients which leads to "autumnal" (like the season : autumn) colors aka "autumning" or "fall colors" on the leaves and buds, totally normal and a good sign actually. it means you're very close to the end and can start flushing. hope this helps !