Radions Gen 4 best Spectrum to date and easily adjustable. I have all my Systems on Radion's now and the corals are looking great and growing. The transition from T5 Led Hybrid did make some corals unhappy and I found very quickly that my new Radions needed to be dialed way back. I have mine 8" off the water running the Coral Lab Program which is 100% Blue spectrum and UV channels, and 24% Whites, Green, and Red. Now I have this program set at 35% which means the Blue Spectrum's are at 35%, but he whites, greens, and reds are at less than 10%. With a Par meter I have very similar Par to the T5 Hybrid setup and running less than 400 watts on 10 Radions. I do have my Frag Tank and Quarantine set at 50%, but the lights are much higher over tank. I just purchase new Par meter that measures LED better, and I am going to bump my lights up 5%, just to see results.
Just be careful with Any Led lights, many who leave them just overpowered their corals with a light they are not used to.