Jelly jars are often vapor proof. Jelly jars are normally used to replace incandescent lights and can be mounted to the ceiling or wall to provide an even light. Jelly jars are rated for wet locations and have the same features as vapor tight fixtures such as keeping out dust and bugs. Jelly jars are designed for commercial environments, but they can also be used for scaffolding and construction site lighting, with fire hydrants, and can even be used on porches and in doorways. Though jelly jars can be considered vapor tight fixtures, we classify them as wall/ceiling flush mounted lights.