Tritium sights basically provide green or yellow sight lights on your shotgun that glow in the dark. They have been nicknamed “night sights” for this reason and get installed on the rear or front of your shotgun. Tritium is described as a radioactive isotope of hydrogen. The sights use tiny vials of tritium that are responsible for emitting its soft green glow. If you are in an area with low lighting or darkness then the tritium sights will allow you to see where you’re aiming.