T12 fluorescent tubes are not made anymore because of poor energy efficiency. While these lamps are still in stock in some stores, replacing the ballast with a more efficient T8 electronic ballast could be a better choice.
Ballast Wiring Diagram
Lamp Compatibility Table
Note: If you have a ballast that is not listed on this site, email us at email@example.com
Fluorescent lamps use a ballast which transforms line voltage to a voltage to start up and operate the lamp(s). Newer fluorescent ballasts are usually rated for both 120 volts and 277 volts. Some are rated for only 120 volts, others for only 277 volts (used in commercial environments).
CFLs for the home have a built-
There are four basic types of fluorescent ballasts:
T8 lamps with a newer electronic ballast use about 20 -
Fluorescent tubes have two common shapes, straight and u-
Up to 4 lamps
Fluorescent 32 watts
Electricians usually refer to a light bulb as a lamp. Light bulb manufacturers use the term “lamp” when referring to fluorescent lights. On this page, we will refer to a fluorescent light bulb as a lamp or tube.
The label on the ballast shows two important labels.
Compatible Lamp types for this ballast
(4) F32T8 -
(4) F25T8 -
(4) F17T8 -
Light fixtures with ballasts sometimes have labels that show the required type of lamp and ballast ( F32T8).
There are three requirements when matching a ballast to a lamp. In the example above, lamp type F32T8 has the following three requirements:
1. Fluorescent lamp
2. 32 watts