Embodiments of the invention include a heated load lock chamber. In one embodiment, a heated load lock chamber includes a chamber body having a plurality of lamp assembles disposed at least partially therein. Each lamp assembly includes a transmissive tube housing a lamp. The transmissive tube extends into the chamber body and provides a pressure barrier isolating the lamp from the interior volume of the load lock chamber. In another embodiment, an open end of the transmissive tube extends through a sidewall of the chamber body. A closed end of the transmissive tube is surrounded by the interior volume of the chamber body and is supported below a top of the chamber body in a spaced apart relation. The open end of the tube is sealed to the sidewall of the chamber body such that the interior of the tube is open to atmosphere.