I haven't taken a shot with the new LEDs in.. The problem with making comparisons is that depending in the time of day and the light project, the lights may look completely different or exactly the same.
I think that with either set of LEDs, one could make the tank look exactly the same by playing with the light mixture.. The main difference, I assume, is that the 6200 led clusters just have an ability to produce a greater amount of blue if wanted..
Personally, that's what I wanted..
The replacent of the yellow diode and one of the red diodes with more white/blue isn't dramatic to the eye, but it will provide a much higher K potential..
This is my opinion, not necessarily fact..