Fluorescent starters are used in many kinds of fluorescent fittings. If a fluorescent tube has stopped working or isn't working correctly, it's often because the starter needs to be replaced. Fortunately, they're very inexpensive and easy to install. The starter is a small plug that slots in next to a fluorescent tube. If a light won't switch on at all, in many cases you just need a new starter. It is also recommended to change the starter every time you replace a tube.