Yellowstone 18 led tent light and fan black control the temperature of your tent and ensure its well lit at night with this led tent light and fan designed to run for a long period on one set of batteries it will ensure you can read before bed and not get too hot during the day on a low setting the light will provide 50 hours of light or if you prefer 16 hours of power for both the light and the fan it runs on d size batteries which are common to retail outlets this clever gadget ca