Color doesn't really matter. Kessil has designed the light in a way that no matter what color you set, the corals always receive the proper amount of blue light they need. So you can set it to whatever is pleasing to the eye and you can throw some greens and reds and violets in there.
Intensity is the one you need to watch. Access to a par meter is best, if you dont, start low and ramp it up slowly over a couple weeks and watch your corals, as you ramp it up if they start to look upset dial it back and that's your sweet spot.