diff --git a/nixops/light.nix b/nixops/light.nix
deleted file mode 100644
index 1227ccc..0000000
--- a/nixops/light.nix
+++ /dev/null
@@ -1,140 +0,0 @@
-{ host }:
-
-{ config, pkgs, ... }:
-let
-  artiq = builtins.getFlake git+https://github.com/m-labs/artiq.git;
-in
-{
-  deployment.targetHost = host;
-  deployment.hasFastConnection = true;
-  nix.nixPath = [ "nixpkgs=${pkgs.path}" ];
-  programs.command-not-found.dbPath = "${pkgs.path}/programs.sqlite";
-
-  imports =
-    [
-      (./. + "/${host}-hardware-configuration.nix")
-    ];
-  nixpkgs.config.packageOverrides = super: let self = super.pkgs; in {
-    pam_p11 = super.pam_p11.overrideAttrs(oa: {
-      patchPhase = oa.patchPhase or "" + ''
-          substituteInPlace src/match_openssh.c --replace \
-            '"%s/.ssh/authorized_keys", pw->pw_dir)' \
-            '"/etc/ssh/authorized_keys.d/%s", pw->pw_name)'
-        '';
-    });
-  };
-
-  networking.hostName = host;
-
-  time.timeZone = "Asia/Hong_Kong";
-
-  # List packages installed in system profile. To search, run:
-  # $ nix search wget
-  documentation.enable = false;
-  nixpkgs.config.allowUnfree = true;
-  environment.systemPackages = with pkgs; [
-    opensc yubikey-manager yubikey-manager-qt yubico-piv-tool
-    wget vim git firefox usbutils pciutils file lm_sensors acpi
-    gimp imagemagick
-    evince
-    (python3.withPackages(ps: with ps; [ numpy scipy ]))
-    psmisc
-    unzip zip gnupg
-    sublime3 rink
-    tmux screen tigervnc
-    artiq.packages.x86_64-linux.openocd-bscanspi
-    any-nix-shell
-  ];
-  programs.wireshark.enable = true;
-
-  services.openssh.enable = true;
-  services.openssh.forwardX11 = true;
-  services.openssh.passwordAuthentication = false;
-  services.openssh.extraConfig =
-    ''
-    StreamLocalBindUnlink yes
-    '';
-  programs.mosh.enable = true;
-
-  services.pcscd.enable = true;
-  programs.ssh.extraConfig =
-    ''
-    PKCS11Provider "${pkgs.opensc}/lib/opensc-pkcs11.so"
-    '';
-  programs.ssh.startAgent = true;
-  programs.ssh.agentPKCS11Whitelist = "${pkgs.opensc}/lib/opensc-pkcs11.so";
-  security.pam.p11.enable = true;
-
-  # Enable CUPS to print documents.
-  services.printing = {
-    enable = true;
-    extraConf =
-      ''
-      Browsing Off
-      BrowseLocalProtocols none
-      '';
-    browsedConf =
-      ''
-      BrowseRemoteProtocols none
-      BrowseProtocols none
-      '';
-  };
-  services.avahi = {
-    enable = true;
-    nssmdns = true;
-  };
-
-  # Enable sound.
-  sound.enable = true;
-  hardware.pulseaudio = {
-    enable = true;
-    package = pkgs.pulseaudioFull;
-  };
-
-  i18n.inputMethod = {
-    enabled = "fcitx";
-    fcitx.engines = with pkgs.fcitx-engines; [ table-extra m17n ];
-  };
-  fonts.fonts = [ pkgs.noto-fonts pkgs.noto-fonts-cjk pkgs.noto-fonts-emoji pkgs.noto-fonts-extra ];
-
-  # Enable the X11 windowing system.
-  services.xserver.enable = true;
-  services.xserver.layout = "us";
-  services.xserver.xkbOptions = "eurosign:e";
-
-  services.xserver.displayManager.lightdm.enable = true;
-  services.xserver.desktopManager.xfce.enable = true;
-
-  systemd.suppressedSystemUnits = [
-      "hibernate.target"
-      "suspend.target"
-      "suspend-then-hibernate.target"
-      "sleep.target"
-      "hybrid-sleep.target"
-      "systemd-hibernate.service"
-      "systemd-hybrid-sleep.service"
-      "systemd-suspend.service"
-      "systemd-suspend-then-hibernate.service"
-  ];
-
-  programs.fish.enable = true;
-  programs.fish.promptInit = ''
-    any-nix-shell fish --info-right | source
-  '';
-  users.mutableUsers = false;
-  users.defaultUserShell = pkgs.fish;
-  users.extraGroups.plugdev = { };
-  users.extraUsers = import ./common-users.nix { inherit pkgs; };
-  
-  security.sudo.wheelNeedsPassword = false;
-  services.udev.packages = [ artiq.packages.x86_64-linux.openocd-bscanspi ];
-  services.udev.extraRules = (import ./extra-udev.nix);
-
-  nix.binaryCachePublicKeys = ["nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc="];
-  nix.binaryCaches = ["https://nixbld.m-labs.hk" "https://cache.nixos.org"];
-  nix.sandboxPaths = ["/opt"];
-
-  nix.extraOptions = ''
-    experimental-features = nix-command flakes impure-derivations
-  '';
-}
diff --git a/nixops/nixops.nix b/nixops/nixops.nix
index 24b9364..a074cf9 100644
--- a/nixops/nixops.nix
+++ b/nixops/nixops.nix
@@ -17,5 +17,4 @@
   chiron = import ./desktop.nix { host = "chiron"; };
   old-nixbld = import ./desktop.nix { host = "old-nixbld"; };
   franz = import ./desktop.nix { host = "franz"; };
-  cnc = import ./light.nix { host = "cnc"; };
 }