The so-called self-flashing phenomenon of energy-saving lamps means that energy-saving lamps will flash for a period of time after turning off the lights, and the length of time varies, usually between 5 and 40 seconds. This phenomenon exists in both day and night, but the brightness of the spatial environment is high during the day and it is not easy to detect during the day. In essence, the self-flashing phenomenon of energy-saving lamps does not have much influence on the life and brightness of energy-saving lamps, but it will be annoying at night. So everyone hates this phenomenon. In the final analysis, the self-flashing phenomenon of energy-saving lamps is that there is a weak current passing through them. The full name of energy-saving lamp should be self-ballasted fluorescent lamp for general lighting. Because it is self-ballasted, there is an electronic ballast in the energy-saving lamp, and each ballast has an electrolytic capacitor for filtering. The weak current is slowly stored in the capacitor. When a certain voltage is reached, the bidirectional trigger tube will trigger discharge, that is, the energy-saving lamp will flash. This weak current exists not only in energy-saving lamps, but also in light bulbs, but light bulbs are resistive loads, and a little current has no effect on them at all. So speaking of which, I have to say why there is a weak current. This is what the Internet said. The switch is connected to the zero line, and there is nightlight on the switch. The room is wet. Theoretically, there is a weak current through the ballast. Caused by self-flashing. Having said that, some people may ask, why are some energy-saving lamps flashing and some energy-saving lamps not flashing in the same line? The answer is as follows: the weak current just mentioned is stored in the electrolytic capacitor, and when it reaches the trigger voltage of the bidirectional trigger tube, the electricity in the capacitor will be discharged through the lamp tube, that is, it will flicker. Then slowly re-store, but the voltage of this weak current is very low. If this voltage does not reach the trigger voltage of the trigger tube, the lamp will not light up. It is easy to understand from the production process. The product consistency of the manufacturer of bidirectional trigger tube is not what everyone understands. It is possible that the voltage is higher and the voltage is lower, which is physically called error. Different batches of products from the same manufacturer are also different, not to mention different manufacturers. So under the same conditions, some flash and some don't.