The Porcelain Lamp Sockets (lamp holders) includes all candelabra, medium (standard) sizes, and mogul size sockets. Porcelain lamp sockets are more heat resistant and typically last much longer than regular phenolic (black plastic) lamp sockets. These porcelain sockets work well when used in fixtures with little or no air circulation available for the light bulb.
Porcelain: The most durable and long lasting shell, porcelain is more heat and weather resistant than any other shell type. Where the light is outside or hangs with a bulb facing down, a porcelain socket is highly recommended.
The base socket has a porcelain body that is gray glazed with ceramic arc shield, allowing for more heat resistance. The 18 AWG, glass braid SEW-2 lugged leads are rated for 200 degrees Celsius, 600 watts and 600 volts. They are 9 inches long and stripped 1/2 inch for convenience. The socket features a durable, nickel-plated copper alloy screw shell, lamp grips, and two screws for easy installation. It is pulse-rated, so it is ideal for use with any medium base pulse-start metal halide bulbs.