Gizmo's Day-Night Mod v2.0 makes the nights darker and longer.
However, the night lights in the game are set to be lit between 20:00 and 01:00.
After 1 am this means the cities will be pitch dark till dawn at 7 am.
This mod extends the time the night lights are lit, to match the day/night cycle in Gizmo's mod.
With this mod, the lights are lit between 18:00 and 07:00.

There is no installer included, as you will have to decide yourself if you want to use the longer night lights or not.

A brief discussion about it and Gizmo's mod can be found here though.

Installation: copy/extract the z___BSC parent folder into your plugins. If you extracted the ~Documents folder into your plugins, too, it's highly recommended to keep it, but move it out of the Plugins folder.

Un-Installing: To un-install the files, simply bulldoze every lot from this download in your cities and delete the files from the plugins folder afterwards.