Pick a good mix for a more broad spectrum. I have seen a mix with 420, 440, 450, 3500k, 6500k and 10000k. The great thing about it having a programmable controller is you have 6 channels to use for each color so that you can customize it however you like
Not too sure exactly what you mean. With the controller you can turn the channels from 0%-100% intensity. You have blue channels and white channels. You can dial in the colors to what you want that way
I use rapidled and reefledlights. My fixture is 1/1 ratio royal blue to cool whites. But I would suggest 2/1 ratio royal blue to cool white. I threw in one of their total spectrum uv LEDs for moonlight and broader spectrum range.