Well, you will not be runnign the reds and greens at full power, correct? The number 4 is mostly for spread, reds are intense, but you would get more spread of the colors with 4. Personally, I prefer osram, or bridgelux reds, as they are available in 660nm, 630nm crees are really red/orange, not that deep red that you want. I would go 50/50 on the red/orange and reds, 4 of each, for 8 total (4 on each side). As for the violets, you cannot add too many, LOL. I personally love the color of violets, and wish they were as powerful as the royal blues.