Light bulb bases and sockets exterior Cap and Shell:
Brass: Brass is the most common materials in a socket shell. There are different finishes in the brass shell like; polished (shiny), antique, and unfinished
Brass plated: Brass plated shells are similar to the brass shells in appearance with a cheaper price. A brass plated shell comes with similar finishes to the solid brass shell.
Nickel plated: Shiny silver finish.
Bakelite/Phenolic: These socket shells are thick black plastic and are typically found in less expensive lighting where the sockets are hidden by the lamp body.
Porcelain lamp holder: 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.
Light bulb bases and sockets are normally defined by a letter-number-letter format, with the last letter optional. The first letter designates the shape or form of the base, the numbers represent either the width of the base or the distance between the pins. The second letter designates the number of pins or contacts on the lamp. The numbers are normally in millimeters. LED light bulb sockets and bases are manufactured to the same standards as halogen, incandescent and other traditional lights.
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