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Light Bulb Stays On When The Switch Is Off & The Reasons Behind

Light bulbs such as incandescent, fluorescent or LED light fixtures are extremely popular and used widely in this modern era. They are all famous for their affordable price, their different features which are friendly with users, suitable for every residential landscape and so are they with working spaces. However, everything has its own problems. Have you experienced the fact that your light bulb stays on when the switch is off. Many people have encountered this issue before. This phenomenon sounds strange, but it does happen in reality. Not only that, this situation is quite common. We usually figure this out mainly in those kinds of electric light mentioned above. 

If you are about to find out the reasons that explain the problem of the light bulb staying on when the switch is off. This article is absolutely for you.

The Light Bulb Stays On When The Switch Is Off & How Comes ?

For that being said, everything has its own problems, so do your LED light lamps. Glowing light bulbs can result from many different reasons. Here are some of these: 

The Led Driver – The Energy Storage

The LED driver, playing the same role as an electrical circuit does. With the assistance of an inductor and a capacitor. The driver is able to do the job of accumulating electricity. When the accumulation is conducted, the electric current will start discharging from the maximum value to zero at the moment that the input voltage is cut off. 

switch off but light still on The driver is able to do the job of accumulating electricity so LED lamps with those residual energy can be still activated
The driver is able to do the job of accumulating electricity so LED lamps with those residual energy can be still activated

Your LED lamps with those residual energy can be still activated because of a high sufficiency. Although you have turned the switch off, your LED light fixtures can possibly carry on working. At this very moment, they often provide a slight level of glow and they keep staying that until all the energy has been completely discharged. The light which emits at this stage will become deeper and fade away. This can take a few minutes at most. The amount of time which makes the dim brightness from your LED light lamps fade away will depend on the type of LED lights which you are using. 

Leaking Electrical Wires

light bulb stays on when switch is off glowing LED light bulbs can potentially happen due to the electrical wiring problem
Glowing LED light bulbs can potentially happen due to the electrical wiring problem

The continuation of glowing LED light bulbs can potentially happen due to the electrical wiring problem. When the wiring work is not completed correctly or the resistance reaches the peak. When the neutral wire, carrying an electric current is earthed improperly, it can lead to the situation that the bulbs are continuously provided the energy by the neutral wire even though your light switch has been turned off before. 

You should also take the insulation into consideration. The electromagnetic induction can possibly be the factor which weakens the brightness of a lamp or breaks the insulators or maybe the insulation itself is poor. It is indicated that because of the insufficient insulation, the phenomenon of slight glow happens if there is a little leakage of electrical current from an aerial cable and a cable which potentially has routing errors can make your LED light lamps keep on emitting the light after you turned them off.  

LED light lamps’ support can be broken due to short circuits. However, circuits themselves are not affected by this “ damage or break the wireproblem. The faulty wires or defective brackets are the factors making the circuits get into this issue. Therefore, a wire accidentally shortcircuited is the main reason for the afterglow phenomenon.   

This common wiring problem can occur because of the hot wire which has a direct connection to the lamp. Hot wire is conductive and without its connection with a light bulb through a wire at the bottom of the fixture, there will be no synchronization between the LED light fixture and the switch.

Lamps’ Low Quality  

light bulb stays on when switch is off The bulbs made from inferior raw materials seem to have issues such as dimming light
The bulbs made from inferior raw materials seem to have issues such as dimming light

Nowadays, the lamps are famous for the models’ diversity. Some samples of them are quite cheap, but there are many different kinds which cost much more than others. To minimize the concern about price, many manufacturers even used poor quality raw materials for their products and of course, price always goes hand in hand with quality. The bulbs made from inferior raw materials seem to have short lifespans and lead to a variety of issues, which commonly are dimming light, glowing intermittently or flashing lighting conditions when you have switched them off before.  

The Light Switches’ Leakage 

For that being said, the lamps are available with many different types and along with that are many types of light switches with more special, more modern and more flexible features, in comparison to other standards. These features can be indicated such as timing, beacons, moving sensors, etc. 

light stays on when switch is off when you turn the switch off, your LED light bulb can still provide a short level of brightness by gaining energy from the switch
When you turn the switch off, your LED light bulb can still provide a short level of brightness by gaining energy from the switch

The amount of energy needed is quite small to maintain the standby mode of the multi-function switches. Once you turned the switch off, your LED light bulb could still provide a short level of brightness by gaining a little bit of energy from the switch

This is also applied to the dimmers. Unless you don’t let the dimmers contact the light bulbs, the same thing would come to LED lights which would emit the light. To get electronic dimmers worked, they need to have enough energy to operate properly. Although the power came off, the LED light bulbs can possibly keep glowing because they gathered the power from these dimmers.

Installing the switches, dimmers improperly or defective switches themselves are also two of the reasons explained for this afterglow issue. Leakage can be indicated that the metal contact points have a short distance to reach each other. Therefore, the electric current transmission is still conducted.  

Like we mentioned previously, switches which are defectively operated can make the lamps keep coming on because of many different reasons. One of them can be realized that the excessive internal loading given can melt the switches down. 

The incompatibility of amperage ratings is seriously addressed , when the compatibility between the switches and the circuits is extremely essential. Imagine you install the switch with a different amperage rating from your circuit. Using a switch with a lower amperage rating than the circuit requires can lead to overheating, losing your switch which makes it useless or even worse it can potentially cause the risk of fire

Compatible Dimmer Switch

ceiling light stays on when switch is off if dimmer switch and led bulb are imcompatible, led bulb may emit the brightness while being turned off
If dimmer switch and led bulb are imcompatible, led bulb may emit the brightness while being turned off

For that being said, the connection between the dimmer switches and the bulbs is obviously important, so all of them need to have a tight compatibility. Otherwise, the phenomenon of still emitting the brightness while being turned off will occur.

For details, you can find out more about dimmable vs non dimmable.

The Energy’s Backfeeding

Sometimes, there is a possibility of the situation that the energy transmitted to the bulbs can conduct the doing of backfeeding through the electrical wiring which is a factor make the bulbs stay on while being switched off.

Solutions To Get Rid Of The Afterglow Problem

This common problem could sound strange, but as mentioned, everything has its own situations to deal with. When it comes to situations, there will be solutions to them. Here are some ways to prevent your LED light lamps from being afterglow:

Take Your Electrical Wiring Into Consideration

light bulb stays on when switch is off Checking the wiring of every single circuit needs to be considered
Checking the wiring of every single circuit needs to be considered

Checking the wiring of every single circuit needs to be considered. In case you feel nervous when you do this work on your own, it is okay when you can ask for the support from the electricians, who are usually testing your electrical wiring professionally to warrant your safety. Remember, unless you see your electrical wires with cracks or other signs of damage which means your wires don’t have enough qualification, you can use them for installation as usual. One more thing, don’t reuse wires which have been shortcircuited, it could be dangerous. 

Furthermore, the energy’s backfeeding problem which we have discussed previously is quite difficult and complex to figure out. So, we all also need some assistance from qualified electricians to find out what is going on and deal with it perfectly well. 

Zener Diodes Installation

light stays on dim when switch is off Zener Diode in the circuit will play the role of an obstacle between the lamps and emitting the lights
Zener Diode in the circuit will play the role of an obstacle between the lamps and emitting the lights

Zener Diode is known as a tool to adjust the voltage of the circuit. When we power the lamps off, Zener Diode in the circuit will play the role of an obstacle between the lamps and emitting the lights, which means it can prevent the lamps from being afterglow after we turned the lights off. The determination of the Zener Diode’s size needs to be found by electricians or maybe a multimeter can help too. Unless the installation of Zener Diode is not conducted correctly, it won’t transmit a voltage until it goes beyond the threshold voltage.   

For instance, a 0.8V Zener diode installed incorrectly will not let a voltage pass through until it goes beyond the limitation of 0.8V and it can also lead to voltage reduction. So measuring the right size of diode is very crucial. 

Alternative Bulbs And Dimmer Switches

light bulb stays on when switch is off you should take the compatibility of the bulbs and the switches into consideration
You should take the compatibility of the bulbs and the switches into consideration

You can deal with this issue easily by replacing your last bulbs for the new ones. Not only LED lights, but the light fixtures with quality components also have a great lifespan. These light fixtures are considered going through many censorship processes and are guaranteed reliability from the manufacturers to make sure that the lamps will not have any problems including being afterglow when you powered them off to warrant customers’ best experience when using the products

Moreover, replacing the dimmer switches should be given attention too. In case you’ve already had a dimmer switch at home, you should take the compatibility of the bulbs and the switches into consideration. 

Bypass Capacitor Installation

light stays on when switch is off a capacitor mentioned above will be a fence which will not allow the leakage forward of the current to occur
A capacitor mentioned above will be a fence which will not allow the leakage forward of the current to occur

The power supply outputs is a place where the bypass capacitor is installed. For instance, there is one wire which passes through and has no connections that can be usually seen in dimmers and switches. As we can see in these two-way linkages, a capacitor mentioned above will be a fence which will not allow the leakage forward of the current to occur. However, just like the previous parts, we recommend you to contact an electrician who has skills and professionalism in the electrical subject to warrant your safety.

The Finale

The light bulb stays on when the switch is off has been happening commonly in social life today and it does have many ways for all of you to deal with it thoroughly.

At this point, we hope you will have more views and more comprehension about the LED light lamps, their operational features and in this article is the answer for the questions: “ Why do they still turn on when being turned off and how to solve this phenomenon which is considered strange ? ”

We appreciate your time reading our article. Thank you & See you next time. All for your safety and comfort !!! 

More LED Issue Guidelines

Lexii is a marketing creative with 6 years in Event, Product, and Social media marketing. She has assisted with coordinating and managing marketing campaigns for Procter & Gamble, and assisted with growth of smaller CPG brands on a national level.

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