Why are my LED lights glowing?


You have something else in the circuit that uses a small amount of power and which bypasses the switch.

A smart-switch of some sort will do this but there are other devices that also do this, for example a switch illuminator (so you can find it in the dark)

The issue here is that, at switch locations you generally do not have neutral present. Just live and switched live (and earth). So the illuminator cannot be wired in parallel but mus be in series with the lighting circuit. When you turn the switch on, it turns the illuminator off because the switch shorts the illuminator so that there is no longer a potential difference across it.

These things pass a very small current, at lower voltage, through the rest of the circuit. This is insufficient to make incandescent or halogen bulbs glow, but is enough for some LED driver circuits to start to...

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I recently replaced over half of the light bulbs in my home with low power LED types. Mostly they work okay and the light they produce is vastly better than fluorescent bulbs plus the power savings, if true, seem impressive but some of them emit a dull glow when switched off. Is the glow cancelling the power savings and adding to my electricity bill?

The performance of LED light bulbs has improved exponentially in the past couple of years and given their long life expectancy, very low power consumption and rapidly falling prices, they are a cost effective alternative to tungsten and compact fluorescent (CFL) bulbs with payback times measured in months rather then years. I expect that we will be hearing more about them in future, particularly with regard to interference, but we will deal first with that mystery glow. This is due to induction and/or capacitance effects, with tiny currents leaking through and across cables in the lighting circuit. It is probably too small an...

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Modern LED lighting is great. Bright, clean and a fraction of the running cost of incandescent lighting such as halogen or tungsten lamps. That said, one oddity is that they sometimes glow when off. But here's a potential quick and dirty fix...

I first noticed the 'glowing when off' issue after I fitted three LED lamps in my home's entranceway back in 2005. LED lamps were in their infancy back then and these cluster lamps aren't great, but they're only lighting a small space and at a paltry 1.3W each they've already saved a sack load of energy over the 11W CFL fitting that was there before.

I did find it curious that when switched off, some of the LED elements in these lamps continued to glow dimly. There have been no ill effects over the past nine years and these lamps continue to work just fine. I came across the problem again today however after converting an R50 fitting from incandescent to LED operation. This time the effect was more noticeable, and...

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The effect is caused by capacitive coupling radiating tiny amounts of energy through the floating neutral side of the domestic wiring. The neutral is floating because it is a "switched neutral" configuration which has the physical switch in the open/disconnected position.

The LED is connected to an ordinary mechanical switch but still glows even when it's supposed to be switched off. There is no dimmer or any other electronic devices attached to the circuit. The circuit used in the video is a dual switched circuit configuration, which is commonly found in hallways and stairwells in the UK.

Multiple switched lighting circuits tend to have much longer wiring runs between the switches, which can make this effect more pronounced. Changing the position of the switches can also change the effective length of the floating side of the circuit and consequently changes the intensity of the glow.

As demonstrated in the video, you need both a susceptible bulb as well as...

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LED stands for light-emitting diode, a type of illumination created by diodes that feature specific elements that lead to the release of electrical energy as different types of light. LEDs are efficient and long-lasting compared to other lighting options, but they also have problems that can develop through the course of their use.

It is common for LEDs to glow after they have been turned off. They might flicker slightly for several minutes, or they may produce a low light, only a fraction of their normal brightness, that does not go away. This may be especially noticeable with a concentrated source of light like a spotlight. If you unplug the LED light entirely, the glow should soon vanish.

Residual Voltage

This glow from the LED lights is caused by residual voltage in the electrical line that powers your spotlight. LED bulbs are made out of a collection of diodes. Just one of these diodes is so efficient that the residual current that still...

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ALL LED lights are able to operate using very small current, that is why they are so cheap to run, examples are electrical appliances having LED indicators, when switched off, the power LED indicator is always last to extinguish.

With LED lighting using AC (whatever voltage), even with the switch for the circuit in the off position capacitance and inductance affects that circuit because a lot of the time there will be high voltage on the live wire to the switch but nothing on the return wire to the LEDs when switched off. Due to inductance this will leak across from the live to the return wire because of its close proximity in the cable. This can be tested with a voltmeter between the return wire to the LEDs and neutral when switched off. All household circuits suffer with this and it is common for a small standing voltage of 5 to 20 volts but the current is only very small i.e. micro-amps. I have LED lighting at home with the same issue (but not in the bedroom for this...

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On a rev3 Uno the pin 13 led is driven by a opamp section acting like a buffer,
Well I never so it is.
That explains it all, I missed that one.

I suspect they did it because it is part of the SPI group of pins and the LED was a load on the pin that maybe interfered with the operation of some SPI devices.

Well done Lefty

This was discussed a couple of days ago on this board, but without anyone actually trying a high value pull-down. Lots of people reporting that they load a sketch that does not use pin 13 at all and sometimes the pin13 would stay on and sometimes it would stay off, so very confusing to them.

I guess it's a case of good intentions (unloading led load from SPI clock signal) having a unintended consequence, led 13 is now not always off when not being used unless you place pin 13 to output and set...

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LED led me astray: the home lighting misadventure that brought me full-circle

By Chris Ziegler on July 1, 2013

If I had known that last weekend was going to be robbed from me by the lighting industry, I probably would’ve just slept through it.

It all started, innocently enough, on Saturday. In the past couple weeks, my home — built in the latter half of the last decade but still lit entirely by old-school incandescent bulbs — had a couple lights burn out, so I trekked to Home Depot in search of replacements. It occurred to me once I got there that I should probably be buying something other than incandescent, given the proliferation of CFL and LED alternatives; they use dramatically less energy, and theoretically, they can last a lot longer. And traditional incandescents are going the way of Google Reader: Wattage restrictions imposed by the federal government means they’re probably going to disappear over time, so you’d better start finding alternatives and...

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Want to install LED lighting? We take light for granted these days. Imagine a day without light with all the banging on the walls, no cooking, no studying, many more accidents and so many nothings. Shouldn’t we then look for long lasting energy efficient good lights?

LED lights make people and things look brighter and striking. They make energy efficient lighting products that save energy, help conserve the environment, reduce maintenance costs and last much longer than traditional lighting.

Comparing LEDs with incandescent, LED bulbs are lit solely by the movement of electrons and hence have no filament that can and will burn out. LEDs do not get very hot and hence, waste less of heat.

Moreover, unlike incandescent LEDs doesn’t contain mercury or any other toxic substance. Fluorescent lights take a lot of time to fully brighten up and longer in colder environment which is not the case with LED lights as they are...

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What causes LED lights to flicker? Why do my energy saving bulbs glow or flicker when turned off? A three-phase lighting distribution system, ... Why Do LEDs Flicker? LED lights are on dimmers: If you have the LED bulbs on a dimmer switch, you will notice the dimming and flickering MORE if the LED lights are slightly dimmed when surge wattage happens. LEDs: Fighting Flicker ... and the lights would be effectively off. Life and light output. Back to FAQ overview. This has long been culprit No. One will flicker when turned off. The most common cause is that your lights are on a two-way circuit or dimmer circuit. ... led-depot.com.au/ led-lights-downlights-flicker On startup, they will cause significant voltage drop in the supply. FAQ . Loose Bulb. ... why wont it turn off all the way? Dimmable LED light bulb. A number of community members have concerns about using automated dimmers and LED lighting loads because of issues with flickering or not turning fully off. Our bathroom light...

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In towns and cities across the world, the colour of night is changing. Traditional yellow sodium street lights are steadily being replaced by white LED lamps. The new lights use less energy, dramatically cutting carbon emissions and saving money. But not everybody is happy.

"When the leaves left the trees and I tried to sleep, I turned to one side and the light's shining right in my eyes."

Like most of us, Karen Snyder had never really paid much attention to street lights. But that all changed last year when the city council began installing LED lights outside her home in a quiet corner of Washington DC.

In addition to the light shining into her bedroom, the 63-year-old teacher's guest room, where she watches TV, is now bathed in something akin to strong moonlight.

"It's like there's a ray coming in. Like a blue ray. Right directly on to the couch. If you are sitting down, the moon would be above the house and you'd get the beautiful feel of the moon....

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Hi, Yes I said LED, not CFL. Hopefully someone here can direct me to help. I am so frustrated, I have tried to reduce our electric usage for over a year. I always was cautious about energy, but I became real strict a year ago. There are so many parts of my issues but I will start with the LED issue today. Anyone know much about LED?

My home was built in 2003, we have lived here 2 years. Almost all the lighting has dimmable switches, not the twist but the ones you tap off. We do have some regular switch lighting outside on timers, and track in the kitchen that I rarely use. We had some motion/ timer lighting installed off the dimmers for rooms, for example my pantry goes on then off after 30 seconds, laundry room.. and my favorite the kids bathroom set for 6 minutes.

Okay, I am SO DONE with CFL I could ramble about my experiences with every brand and design, even with the dimmable ones.

We picked up a single LED bulb today to test before investing.

I put...

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Another great thing about this product is that you can save the plastic parts of the glasses and use them later, because ...

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This remains a phenomenally bad idea. Instructables should have nothing to do with promoting it, and neither should anyone else. Aside from the glib, "impress . . . your city officials," which actually means something(i.e., demands allocations of resources, your tax dollars, to clean up someone else's mess, i.e., yours), it has "pollution" written all over. Tossing lithium batteries into the environment wildly-nilly, along with the rest of the ingredients of a "Throwy,"(it sounds so fun!) is the height of irresponsibility, the companies selling parts specifically for such should be sanctioned as well. I'm not opposed to childish behavior, which this is(it is not "art" on any level). But if you must, go throw toilet paper rolls over your friends' trees, or some such thing. Lithium-ion batteries are classified as "hazardous waste," whether in your phone, portable drill, Tesla, or "Throwy," and should be disposed of properly, without exception. I haven't even touched on the pollution...

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