I have to admit that I did not build my lights with any particular color temperature in mind. However, I wanted something closer to cool white than anything warmer. That is why I decided to have a 2:1 ratios for CW to NW. However, the way the LEDs and the drivers are wired, I suppose I can put the CW and NW on separate dimmer channels to "balance" the color temperatures. But since I am happy with the current light color, I doubt that I will go to the added trouble. I did build another XPG light with a 1:1 ratio of CW to NW. I thought there would be a noticeable difference, but I honestly can't tell if it is any warmer than the XML. It looks fine over the plants (a little like sunlight).
From reading the many posts here, I concluded that 2:1 was close to what I would want. However, I think all CW would have been perfectly acceptable (and provide more light output). Having built the lights, the color temperature aspect does not seem crucial to me anymore. I hope this helps a little.