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if ("IF") the impulse and bussard coils are kinda heat-based, and the ship is equipped with a half-power (experimental, temporal, or replacement) core then we can assume the engines and bussards are actually "cold", meaning that red is full heat/power.
So this is a question that I have wondered for a while now, where did the Idea that prototypes have blue impulse engines and orange bussards come from? As I recall, none of the Prototypes we have seen in star trek have them.