star trek - What was the purpose of adding red backlights in USS Enterprise?

I haven't found any red backlight in Enterprise NX-01:

I have also not found it in initial USS Enterprise NCC-1701-A, but this image tells it had one red backlight (not sure its legitimate image or not):

I have found three red backlights in USS Enterprise NCC-1701-D:

Out of these three red backlights, two were turned off in initial intro of ST:TNG TV series:
USS Enterprise NCC-1701-D

USS Enterprise NCC-1701-E also had two red backlights:

Now, my question: NX-01 didn't have red backlights. Why did they put them on later versions? What was the purpose of red backlights on a starship which had nothing to do with traffic standards? On what conditions, they turned off red backlights (as displayed in initial intro of ST:TNG)?

Answer

They are the impulse engines. The fact that they weren't on the original is an omission, as they are huge plasma vents. It's noted elsewhere that the impulse engines of other ships glow blue.

Comments

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