photoBooth/photobooth-app/config/plugin_gpiolights.json

{
  "enabled": false,
  "gpio_lights": [
    {
      "enable": true,
      "description": "main light",
      "gpio_pin": 2,
      "active_high": false,
      "events": [
        "on@countdown_start",
        "off@after_capture"
      ]
    }
  ]
}