Miro Hrončok 
Looking at the laptop screen at night with no surrounding ambient light is uncomfortable.
I struggled with the 2 low settings of brightness: a blank display (0%) or lasers into my eyes (10%).
`brightnessctl set 1%` is good.
Now I've figured out that #Xfce can change the number of steps (from the default 10). Moreover, it supports exponential steps (more natural for the human eye).
With 27 exponential steps, the first 10 options are "almost 0%". Perfection!
Marcos Dione