And Redshift for Debian 10 adjusts the Color Temperature according to the position of the Sun.
So as a Blue Light Filter a different Color Temperature is set during Night and Daytime.
Moreover, during twilight and early Morning, the Color Temperature transitions smoothly from Night to daytime temperature to allow your Eyes to slowly adapt. At Night the Color Temperature should be set to match the Lamps in your Room.
Especially relevant: on GNOME instead you may simply make use of the Night Light Settings Applet!
1. Terminal QuickStart
How to QuickStart with Command Line on Debian
First, Update the Apt Repo Sources with:
sudo apt update
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