Vapor Tight Fixtures and Barn Light Fixtures are made to withstand harsh environments. Because of this, they protect the light source from dust, dirt, and moisture. The main difference between the two is the size of the lights. Barn light fixtures are large outdoor LED light fixtures that replace different wattages of metal halide bulbs. Many barn lights also have photocells so that they provide a smart lighting option by being able to detect movement and will have a longer life. Vapor tight fixtures are commercial lights. These fixtures often replace CFL bulbs and are ideal for parking garages, corporate campuses, education and storage facilities, car washes, and more.