Different colored lenses are widely used on military flashlights, especially on night vision devices. Each color will serve specific purpose and for RED; it uses to cut down the light at night so you will not become the target of your enemies as well as preserving your night vision.

FMA Airsoft has just released the Red Cover for your TMC dummy PVS15 / PVS18.....ever want to simulate the real situation as seen in battlefield, simply install one then everyone will surprise how professional you are.