LED Color, or my OCD is acting up

[bobschneider]

I just put together a system with recent Accuphase gear: a E-600 integrated amp, DP-550 SACD player, and T-1100 tuner. These were all models introduced in the early 2010s, and were current at the same time. It sounds excellent on my PMC OB1i speakers. And the physical design is very coordinated when the gear is off.

However, each component has various LED numeric displays. The ones on the amp and SACD player are orange, but the LEDs on the tuner are red. Why? Is there some technical reason, or do the lower tier Accuphase components use orange while the higher tier use red? Or is there another reason?