Some friends said that the LED tubes at home are normally used well, but sometimes they flash after turning off the lights. Why does this happen? In fact, the service life of lamps will also be affected in the long run. Today, let's take you to understand why the lights flash after you turn off the lights?
Whether it is LED lamp tube, LED panel lamp or LED downlight, as long as the lamp with LED chip is turned off, the main reason is that the lamp is charged after turning off the lamp. The LED chip is particularly sensitive to current. Even if a wire does not form a current loop, a small amount of light will still be emitted under various complex induction states. There are the following situations:
1. The switch controls the zero line and the live line directly enters the lamp
This is the most common cause of light emission. After turning on the control zero line, turning off the light only cuts off the power circuit of the lamp. If the live wire is still connected to the lamp, the lamp will glow.
Solution: Reconnect the circuit and let the switch control the live wire.
2. The switch is equipped with indicator light or electronic switch is used
Many switches have indicator lights. If the indicator lights are powered on after the lights are turned off, there will be current flowing through the lamps. Some lamps use electronic light switch, such as infrared switch, voice control light switch, and remote control switch. This type of switch cannot completely cut off the circuit. It will also cause the lamp to light up after turning off.
Solution: Remove the switch indicator or replace the mechanical switch.
3. Wrong wiring mode of dual control switch
There are many wiring methods for the dual control switch. If the electrician adopts the following wiring method, the light will dim after turning off the light.
Solution: Reconnect according to the way that the zero line enters the light and the live line is controlled.
4. Zero line electrification
If the above problems are solved, and the lamp will still be on after turning off at night, it is necessary to consider that the zero line is charged. Theoretically, as long as the switch disconnects the live line, there will be no voltage on the zero line of the lamp, and no induced current can be formed. In real life, neutral electrification is very common. If the zero line is not well grounded, the line is too long, the line diameter is thin, or the zero line current is too large, it will cause the zero line to be electrified.
Solution: It is difficult to solve the problem of zero line electrification unless the transmission line is reconstructed. Make the lamp not touch the conductive body, such as the wall, roof, and steel keel, which can also reduce the luminous phenomenon, but can not be completely solved.
The lighting brings us beautiful enjoyment. We should pay great attention to the installation and use of lamps and lanterns. We should be careful with all appliances related to household electricity. In case of abnormal situations, we must find professionals to solve them. In addition to routine maintenance and installation, we need to find a professional LED lamp manufacturer to purchase lamps, which can solve our worries.
