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    Compact fluorescent Plug-In light bulbs have either 2 pins or 4 pins.

    Each 2-pin lamp has an internal starter and is designed for preheat, magnetic operation.

    The 4-pin lamps are designed for electronic ballast operation and are dimmable. These lamps have no internal starter; starting the lamps is a function of the ballast.

    The following illustrations show some of the most popular Compact Fluorescent Plug-In bases:

    Base Top Down Lamp Profile
    2-Pin 1-Tube CFL

    2-Pin 2-Tubes CFL

    4-Pin 1-Tube CFL

    4-Pin 2-Tube CFL

    4-Pin 3-Tube CFL

    4-Pin 4-Tube CFL

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