There is a new application available for Sparkers: Gammy
What is Gammy?
Adaptive screen brightness/temperature for Windows, Linux, FreeBSD. It is a tool for adjusting pixel brightness/temperature automatically or manually. It can dim the screen if its content is too bright, or brighten it otherwise. This can help your eyes adjust when switching between dark and light windows, especially at night or in suboptimal lighting conditions.
Installation (Sparky 6 amd64 & i386):
sudo apt update
sudo apt install gammy
Copyright (C) Francesco Fusco
License: GNU GPL-3