Read the DynDOLOD_Manual.html "Glow LOD" section.
FXGlow, Windows and Fake Light are all different things that do not influence each other.
Typically the window brightness and color tone depend on Weather and ENB settings. If using the Windows High setting when generating LOD, then those Whiterun LOD windows use the same meshes/textures settings as the windows of the full models. That means they should have the same brightness and color tone as the windows of the full model for the same distance.
You can test the distance influence by getting closer so it loads the full model, then use TLC in console to fly backwards to about the same distance again to compare.
As explained in the manual you can install RaceMenu NetImmerse Override to in order to have an option in the DynDOLOD SkyUI MCM to increase the intensity. However, when the difference is high enough, the change in brightness will becomes more obvious when LOD changes to full model.
Easiest is to increase the appropriate ENB settings as they will apply to both the full model and LOD.