Hi Peeps
Random Kelvin-timeline starship observation I recently made - of the Enterprise from the 09 movie: the bussards remain unlit (dark inky blue/black) while at impulse - and only seen to spin/glow blue when at warp.
This may have been obvious to most, however Ive only just realised this. It should be noted that, as of Trek Beyond, the bussards are then seen glowing and spinning while at impulse, as well as warp.
Edit: I’ve just noticed that the bussards are spinning / glow in Into Darkness also. So would appear to just unique to Trek 09 only.