4-Pin Plug In Compact Fluorescent Light Bulbs - Quad Tube
4-pin plug in compact fluorescent of the quad tube variation have been used in recessed lighting and a variety of other applications. Sometimes these are also called Dulux D, Biax or PL-C lamps. Typically used with electronic ballasts and very energy efficient. Another plus is the ability to dim these lamps when used with a dimmable ballast only. The 4 pin configuration fits specifically with socket that is made for this type of lamp only. If you're not sure about which one you have, please call or e-mail for more information.