The links you provide lead to Gnome Desktop instructions, so you are definitely on the right track by redirecting your question for Zorin OS Lite (XFCE desktop).
The Night Light in Zorin Core is a Gnome-Shell extension.
So, in XFCE you should use the app Redshift
sudo apt install redshift
Launch redshift and configure.
EDIT: Bourne and I were typing at the same time, it seems. His suggestion of fluxgui is equally good to Redshift. Why not try out both apps (install only one a time) and then choose the one you prefer.
Once you run redshift and set to auto start you can find redshift in your Startup Applications and change the command to something like:
redshift -t 6500:4500 -b 0.5 -l 0:51.28
-t DAY:NIGHT Range is 1000 (warm) to 25000 (cool)
-b Brightness range 0.1 to 1.0
-l LAT:LON Optional in case the auto location provider doesn’t work for you
For on demand (works regardless of location):
redshift -P -O 4500 -b 0.5
-P Resets any existing temp changes before applying a new one
-O Sets a one time temp
-b Brightness range 0.1 to 1.0
sudo apt install redshift ─╯
Reading package lists... Done
Building dependency tree
Reading state information... Done
redshift is already the newest version (1.12-2).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
```
but I think redshift is installed in zorin lite by default, and we can get it in the systray in taskbar. a lot of new zorin lite users don't enable status tray plugin , I have noticed that especially with zorin lite pro users. so ensure first u enable status tray plugin( I mean does u have icons for WiFi or Ethernet in the taskbar? if yes then do like as in the above posts, if u don't have u can enable status tray plugin
Ich möchte gerne den Nachtmodus für wärmere Farben in XFCE verwenden. Sind die Erweiterungen und die Befehle noch aktuell oder kann man das auch direkt im System einstellen?