I am pretty sure from stock that the reverse lights are incandescents, which the rear turn signals are too. You probably did a swapout to make the reverse lights LED. When I swapped all my incandescents out I cleaned the lenses then put the bulbs in. I think it improves visibility.
The reverse lights are LED's, but are quite dim in my opinion.
The turn signals and license plate are incandescent.
I swapped out the license plate bulbs with LED's and it does help a tiny bit.
I have some rear LED back up lights which I previously ordered for my G37xS, but are hesitant to install them...not sure if they will make any difference.
I'll install them someday and find out.