SON T - External Ignitor

SON-T tubular lamps are gas discharge lamps that use sodium to produce light via wavelengths. They are often used in industrial lighting and are one of the oldest types of gas discharge lamp there is. The way to tell if it has no internal ignitor (i.e. the ignitor is external) is to look at the small triangle which should be etched onto the lamp itself. It will have the letter “E” in it if it has no internal ignitor. If there is no lamp in the luminaire currently, look at the gear tray and see if there is an ignitor wired into the circuit. In traditional lighting magnetic ballast circuits, you should have a ballast, capacitor and ignitor. If an ignitor is present in your circuit, you need a lamp without an internal ignitor.