My eyes are a big fan of redshift. Redshift changes your display's colour temperature to make it a lot easier on your eyes (especially in dark settings).
Now, you could install and use something like like redshift-gtk, which gives you a tray application which allows you to enable/disable redshift etc. However, on my basic i3wm setup, I prefer to control redshift a bit more manually.
For A few reasons for this is:
- I generally don't like extra processes and apps running;
- I don't like tray apps in general (I don't know why... they just annoy me);
- I like bindsym-ming stuff I use often;
Modify your i3 config
We're going to add a an i3 binding mode, which we will call with a bindsym ($mod+r for example). This will show several options for controlling redshift (these options will usually show up at the bottom left of your screen).