nixos/system/light-actkbd.nix

{ pkgs, ... }:

{
  programs.light.enable = true;

  services.actkbd = {
    enable = true;
    bindings = [
      {
        keys = [ 225 ];
        events = [ "key" ];
        command = "${pkgs.light}/bin/light -A 10";
      }
      {
        keys = [ 224 ];
        events = [ "key" ];
        command = "${pkgs.light}/bin/light -U 10";
      }
    ];
  };
}