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G or Bi-pin light bulb base and sockets

The "G" base type of lamp and light bulb is used to designate a "pinned" base. This can include several pin types and different numbers of pins.

Designation is by letter(s)-numbers-optional letter: The first letters include "G" followed by an optional U, X, Y or Z. Next is a number that designates the number of millimeters between the center of each pin. Finally the optional final letter designates the number of pins, no letter implies 2 pins as does a d for double. Pin number designations include: s : Single, d : Double, t : Triple for 3 pins and q : Quadruple for 4 pins. 
Examples include: GU10 base (Ceramic lamp fitting for standard GU10 bulb
Suitable for LED, CFL and Halogen
Use this to fit any GU10 bulb into a hard wire system.
It allows you to plug in your LED, CFL or Halogen bulb, and attach it to the normal lighting wire.
Length of the Leads：About 8.5cm), G24q base type, or for T8 tubes G13 bi-pin.

LED Light Bulb GU10 E26 Adapter This adapter turns a bi pin GU10 base into a standard screw in E27 base. Allows you to install a GU10 light bulb into a medium screw in socket and adds 3 4 inch in length to the overall length of the original bulb. When you insert a GU10 based bulb into this adapter extender you lengthen the bulb by 3 4 inch and convert the base to a standard Edison medium screw in base.