On my big tank, I have half and half, blue and white, just 6 of the linkable individual LEDs. Looks good...the blue is subdued. I definitely prefer the white, though. I thought about changing to 4 white and 2 blue.
But I have seen some very, very blue "moonlights" that pop like actinics.
This is for my FW planted tank, so blue would look dumb. I am trying to find plain old white ones.