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

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

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

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

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

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

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. 

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

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

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

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

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

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

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

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

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