How fluorescent lamps work
At the beginning of turning on the light, "A and B" are connected to "C and D" through the glow starter, and the filaments are energized in series to preheat. Then, the glow starter is disconnected due to power-on and heat, so that the magnetic ballast generates high voltage, which breaks down the "Panning" gas in the lamp tube, and the light is on.
Finally, the inductive ballast keeps a certain current between A and D, and the lamp emits stably.
