Your eyeballs will thank you for this

.zshrc

# Set brightness of external display
# Reference material for https://youtu.be/_Vy7m-LhGEc episode
b() {
  if [ -z "$1" ] || [ "$1" = "--help" ]; then
    printf "%s\n" "Usage: b integer"
    return 0
  fi
  m1ddc set luminance $1 > /dev/null
}