I heard the disks give you colors you can't get from other sabers. I read that the red disc gives you a nice orange, which isn't on the rgb.
Interesting! There might be an orange disc that does that. The red disc, as far as I have seen, makes silver blade a pinkish color. You should talk to Deep or Ultra about this, maybe they can resistor one of the leds in such a way that you get the orange you want instead of yellow?