LIGHT AND LAMP BASES 

With the variety of lighting technologies available in the market today, different lamp bases have been developed for use in a multitude of applications. Below is more information on some of the most common lamp bases found in the market and their applications.  

Edison Screw Bases

E12 Base (Candelabra)

Small Screw-in base, 12mm in diameter. Typically found on Candelabra bulbs used in applications such as Chandeliers.

E26 Base (Medium)

Standard Edison Screw-in Base used with many lamp shapes. Base is 26 mm in diameter.

E39 Base (Mogul)

E39 Base (Mogul): Large Screw-in Base typically found on Metal Halide, HPS, and other HID light sources. Base is 39 mm in diameter.

EX39 Base (Extended-Tip Mogul)

Mogul Sized Screw-in Base with Extended Tip. This base is found on Metal Halide lamps intended for use in open fixtures. 

Plug-In Style Bases

GU10 Base

Bayonet style twist-lock pin-pin connector.  Pins spaced 10mm. Used with Incandescent and CFLs. 

GU24 Base

Bayonet style twist-lock pin-pin connector.  Pins spaced 24 mm. Used on Incandescent and CFLs.

​G23 Base

Bi-Pin plug-in base with one pair of retaining clips.  Used with twin tube CFLs between 7W and 11W. Pins are spaced 23mm apart. 

Gx23-1 Base 

Bi-pin plug-in base with two pairs of retaining clips. Used with twin tube 13W CFLs. Pins are spaced 23 mm apart.

GX23-2 Base

Bi-pin plug-in base. Similar to Gx23-1 but with a wider base. Used on 13W Double Twin Tube CFLs. 

G24D-1 Base

2-pin plug-in lamp.  Pins are arranged horizontally around the stem. Found on 13W CFLs that operate on magnetic ballast. 

G24D-2 Base

2-pin plug-in lamp. Pins are arranged horizontally around the stem. Found on 18W CFLs that operate on magnetic ballast.

G24D-3 Base

2-pin plug-in lamp.  Pins are arranged horizontally around the stem. Found on 26W CFLs that operate on a magnetic ballast.

GX24Q-1 Base

4-Pin Plug-in Base.  Supporting Stem is shorter than G24.  Found on 13W Triple Tube CFLs

GX24Q-2 Base

4-Pin Plug-in Base.  Supporting Stem is shorter than G24.  Found on 18W Triple Tube CFLs

GX24Q-3 Base

4-Pin Plug-in Base.  Supporting Stem is shorter than G24.  Found on 26W & 32W Triple Tube CFLs

GX24Q-4 Base

4-Pin Plug-in Base.  Supporting Stem is shorter than G24.  Found on 42W Triple Tube CFLs