Higher CCT fluorescent/T5 like 5000K and 6500K work great for greens and clones. However Higher CCT LED have a very different spectrum and may not perform as well Higher CCT fluorescent/T5.
Charts below show the standard 80 CRI spectrum for Samsung 561C LED. We recommend 4000K and 5000K for greens and clones. We do not recommend using 6500K LED