Redshift adjusts the color temperature of your screen according to your surroundings. This may help your eyes hurt less if you are working in front of the screen at night.
It is available as a bundle for Cinnamon, Mate and Openbox DEs through the bundles application.
Once activated, run the application from the main menu. The application will then be controlled from the system tray.
The configurations can be adjusted by changing the file /home/guest/.config/redshift.conf.