The QE cold storage surface lamps are vapor-proof and made of an aluminum die-cast base and grill. Finished in epoxy powder coating paint for long life, the thick glass globe is tempered and defused. The socket is porcelain and the lamp source features standard max wattage. Protection grade is IP44 and is designed to work up to -50 degrees Celsius / -58 degrees Fahrenheit. Conveniently individually boxed and packaged.