Home LED Flickers

On Sunday, December 16, 2018 at 4:25:43 PM UTC-5, tabb...@gmail.com wrote:

On Sunday, 16 December 2018 20:46:34 UTC, frankco...@gmail.com wrote:
On Tuesday, December 11, 2018 at 7:44:07 PM UTC-5, tub...@myshop.com wrote:

I got a 60W Equliv. LED bulb in a fixture that flickers all the time.
Its not very old. It does produce enough light but gets annoying after
awhile. They only cost a buck or two, so i'll just replace it, but I
wonder what is causing the flicker?

My guess is a cheap electrolytic in the rectifier, but I have never
really seen a schematic for how they are wired.

This is my opinion. They are made very cheaply they aren't made with much shielding so anything can cause them to flicker.

that simply isn't so. The nature of the circuits makes them robust against RFI.


NT

Nevermind my comment on RF. I had my thought train crossing.

I do think these are made cheaply and they would have to be in order to turn a profit. As far as RF, nah that isn't going to cause flicker. The bulb itself is DC and if there was any RF it would simply be super imposed onto a DC bias which the amplitude from any RFI would be so insignificant and wouldn't matter because well it's a diode. The driver shouldn't respond to RFI because it's an AC/DC converter and the DC is probably being switched which alone would cause RF. Just the AC is creating a field. I really couldn't say exactly what is causing the flicker because I am not present to check the entire circuit. As far as what can cause it. Bad wiring, bad can, bad bulb, corrosion, bulb not installed all the way. Things of that nature. Could be a bad solder joint. I have a Saab which has a bulb out detector. These are notorious for bad solder joints and the symptoms are a headlamp bulb that can flicker or come on and out and you know it all responds to vibration and of course temperature for obvious reasons.

Bring back that cheaply made stuff. Yeah they aren't exactly made to last forever because you need to consider the planned obsolesce part. Yes they have been known to last 10+ years but not all of them do and it is because of chance or was it designed to? One can pickup these 60W equivalent 2 packs in HD for 5 bucks when they are on clearance. The retailer still makes a profit the distributor makes a profit the designer, etc. Everyone still gets their money. Maybe not the amount they had in mind by they never give away anything.

My worthless 2 cents

 

On Monday, December 17, 2018 at 3:55:22 PM UTC-5, tabb...@gmail.com wrote:

On Monday, 17 December 2018 20:10:27 UTC, frankco...@gmail.com wrote:
On Sunday, December 16, 2018 at 4:25:43 PM UTC-5, tabby wrote:
On Sunday, 16 December 2018 20:46:34 UTC, frankco...@gmail.com wrote:
On Tuesday, December 11, 2018 at 7:44:07 PM UTC-5, tub...@myshop.com wrote:

I got a 60W Equliv. LED bulb in a fixture that flickers all the time.
Its not very old. It does produce enough light but gets annoying after
awhile. They only cost a buck or two, so i'll just replace it, but I
wonder what is causing the flicker?

My guess is a cheap electrolytic in the rectifier, but I have never
really seen a schematic for how they are wired.

This is my opinion. They are made very cheaply they aren't made with much shielding so anything can cause them to flicker.

that simply isn't so. The nature of the circuits makes them robust against RFI.


NT

Nevermind my comment on RF. I had my thought train crossing.

I do think these are made cheaply and they would have to be in order to turn a profit. As far as RF, nah that isn't going to cause flicker. The bulb itself is DC and if there was any RF it would simply be super imposed onto a DC bias which the amplitude from any RFI would be so insignificant and wouldn't matter because well it's a diode. The driver shouldn't respond to RFI because it's an AC/DC converter and the DC is probably being switched which alone would cause RF. Just the AC is creating a field.

The reason the driver doesn't cause flicker in response to RFI is it consists of
1. rectifier & reservoir, which couldn't care less what comes its way
2. oscillator, which is too busy slamming into one rail after the other for rfi to make much difference.

If there were low level analogue signals getting amplified it might be a different story.


I really couldn't say exactly what is causing the flicker because I am not present to check the entire circuit.

the OP never gave us enough info to narrow it down at all.


NT

RF aside the simple answer is it flickers because the person didn't install it correctly, the wiring is crap, or the lamp is a POS. they are made to be replaced

 

On Monday, December 17, 2018 at 3:55:22 PM UTC-5, tabb...@gmail.com wrote:

On Monday, 17 December 2018 20:10:27 UTC, frankco...@gmail.com wrote:
On Sunday, December 16, 2018 at 4:25:43 PM UTC-5, tabby wrote:
On Sunday, 16 December 2018 20:46:34 UTC, frankco...@gmail.com wrote:
On Tuesday, December 11, 2018 at 7:44:07 PM UTC-5, tub...@myshop.com wrote:

I got a 60W Equliv. LED bulb in a fixture that flickers all the time.
Its not very old. It does produce enough light but gets annoying after
awhile. They only cost a buck or two, so i'll just replace it, but I
wonder what is causing the flicker?

My guess is a cheap electrolytic in the rectifier, but I have never
really seen a schematic for how they are wired.

This is my opinion. They are made very cheaply they aren't made with much shielding so anything can cause them to flicker.

that simply isn't so. The nature of the circuits makes them robust against RFI.


NT

Nevermind my comment on RF. I had my thought train crossing.

I do think these are made cheaply and they would have to be in order to turn a profit. As far as RF, nah that isn't going to cause flicker. The bulb itself is DC and if there was any RF it would simply be super imposed onto a DC bias which the amplitude from any RFI would be so insignificant and wouldn't matter because well it's a diode. The driver shouldn't respond to RFI because it's an AC/DC converter and the DC is probably being switched which alone would cause RF. Just the AC is creating a field.

The reason the driver doesn't cause flicker in response to RFI is it consists of
1. rectifier & reservoir, which couldn't care less what comes its way
2. oscillator, which is too busy slamming into one rail after the other for rfi to make much difference.

If there were low level analogue signals getting amplified it might be a different story.


I really couldn't say exactly what is causing the flicker because I am not present to check the entire circuit.

the OP never gave us enough info to narrow it down at all.


NT

the OP never gave us enough info to narrow it down at all.

is basically a reiterating of what i said. i'm not present in the persons home.

RF isn't a problem anyways because the only signal with great enough amplitude to cause problems are at such low frequencies. there simply isn't enough energy. shorter wavelength = higher frequency = higher energy. i can tell you though if you hooked up an oscilloscope you probably could pickup signalling from something around, but again it's all being fed to a diode one way or another.

 

On Monday, 17 December 2018 20:10:27 UTC, frankco...@gmail.com wrote:

On Sunday, December 16, 2018 at 4:25:43 PM UTC-5, tabby wrote:
On Sunday, 16 December 2018 20:46:34 UTC, frankco...@gmail.com wrote:
On Tuesday, December 11, 2018 at 7:44:07 PM UTC-5, tub...@myshop.com wrote:

I got a 60W Equliv. LED bulb in a fixture that flickers all the time.
Its not very old. It does produce enough light but gets annoying after
awhile. They only cost a buck or two, so i'll just replace it, but I
wonder what is causing the flicker?

My guess is a cheap electrolytic in the rectifier, but I have never
really seen a schematic for how they are wired.

This is my opinion. They are made very cheaply they aren't made with much shielding so anything can cause them to flicker.

that simply isn't so. The nature of the circuits makes them robust against RFI.


NT

Nevermind my comment on RF. I had my thought train crossing.

I do think these are made cheaply and they would have to be in order to turn a profit. As far as RF, nah that isn't going to cause flicker. The bulb itself is DC and if there was any RF it would simply be super imposed onto a DC bias which the amplitude from any RFI would be so insignificant and wouldn't matter because well it's a diode. The driver shouldn't respond to RFI because it's an AC/DC converter and the DC is probably being switched which alone would cause RF. Just the AC is creating a field.

The reason the driver doesn't cause flicker in response to RFI is it consists of
1. rectifier & reservoir, which couldn't care less what comes its way
2. oscillator, which is too busy slamming into one rail after the other for rfi to make much difference.

If there were low level analogue signals getting amplified it might be a different story.


> I really couldn't say exactly what is causing the flicker because I am not present to check the entire circuit.

the OP never gave us enough info to narrow it down at all.


NT

 

On Monday, 17 December 2018 21:30:25 UTC, frankco...@gmail.com wrote:

On Tuesday, December 11, 2018 at 7:44:07 PM UTC-5, tub...@myshop.com wrote:

I got a 60W Equliv. LED bulb in a fixture that flickers all the time.
Its not very old. It does produce enough light but gets annoying after
awhile. They only cost a buck or two, so i'll just replace it, but I
wonder what is causing the flicker?

RF aside the simple answer is it flickers because the person didn't install it correctly, the wiring is crap, or the lamp is a POS. they are made to be replaced

Or one of the other usual reasons.


NT

 

On Thu, 13 Dec 2018 03:24:56 -0600, Fox's Mercantile <jdangus@att.net>
wrote:

On 12/13/18 2:58 AM, tubeguy@myshop.com wrote:
I bought a bunch of them at Walmart and then Dollar
Tree was selling some for ONE DOLLAR (US) for TWO PACK. I stocked up.
I am not sure which is in this fixture, but no others flicker from
either store.....

So, why don't ya just replace the thing and be done with it?

I already did replace it. No more flicker. I only posted this to learn
what could cause flicker to occur....

 

[Michael Terrell]

On Wednesday, December 12, 2018 at 10:18:52 AM UTC-5, pf...@aol.com wrote:

On Wednesday, December 12, 2018 at 9:37:20 AM UTC-5, tabb...@gmail.com wrote:
On Wednesday, 12 December 2018 13:26:18 UTC, pf...@aol.com wrote:

There are two parts of an LED lamp/fixture.

a) The LED emitters themselves: These are pretty generic beasts, and while not-quite-one-size-fits-all, the same emitter may provide light from between 3000K to 5000K. They are also pretty bullet-proof.

in excellent quality lamps maybe. Not at all bullet-proof in domestic LED lights.


Possibly true, but the failure mode of an emitter is not flicker.

A broken bonding wire will cause a flicker as it heats, then opens. It cools and comes back on. Not that you actually know anything about Semiconductors and how the dies connect to the outside world. Stick with your junk, tube amplifiers and radios.

I have done autopsies on a handful of failed LED bulbs Every one so far has had the case vent on the Electrolytic capacitor, and spraying the electrolyte inside the plastic case. The bulbs are easy to open. A thin film of RTV holds the dome on the bas. Twist it and it breaks free. Once they are open, there are two solder pads from the bottom part. Unsolder them, and you can replace the electrolytic. I was more interested in converting some of the to 12Volts instead of repairing them. The internal construction was identical on the $1 Sunbeam bulbs as higher priced, better known brands.

 

[Michael Terrell]

On Wednesday, December 12, 2018 at 4:01:17 PM UTC-5, Fox's Mercantile wrote:

On 12/12/18 11:26 AM, pfjw@aol.com wrote:
Another challenging variable for LED lamps to avoid flickering
is through dimming.

Surprisingly, the two cheap 60 Watt dimmable LEDs I bought at Walmart,
work just fine with the old photo cell socket "night light" adapters.
Designed to work with incandescent bulbs, I found out they only take
month or two to kill halogen bulbs.

He is BT 2.0

 

[Fox's Mercantile]

On 4/11/19 9:48 PM, Michael Terrell wrote:

On Wednesday, December 12, 2018 at 4:01:17 PM UTC-5, Fox's Mercantile wrote:
On 12/12/18 11:26 AM, pfjw@aol.com wrote:
Another challenging variable for LED lamps to avoid flickering
is through dimming.

Surprisingly, the two cheap 60 Watt dimmable LEDs I bought at Walmart,
work just fine with the old photo cell socket "night light" adapters.
Designed to work with incandescent bulbs, I found out they only take
month or two to kill halogen bulbs.

He is BT 2.0

It took you almost 4 months to come up with this?
Crawl back under your rock you miserable bitter old man.

--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com

 

[Michael Terrell]

On Friday, April 12, 2019 at 5:44:49 AM UTC-4, Fox's Mercantile wrote:

On 4/11/19 9:48 PM, Michael Terrell wrote:
On Wednesday, December 12, 2018 at 4:01:17 PM UTC-5, Fox's Mercantile wrote:
On 12/12/18 11:26 AM, pfjw@aol.com wrote:
Another challenging variable for LED lamps to avoid flickering
is through dimming.

Surprisingly, the two cheap 60 Watt dimmable LEDs I bought at Walmart,
work just fine with the old photo cell socket "night light" adapters.
Designed to work with incandescent bulbs, I found out they only take
month or two to kill halogen bulbs.

He is BT 2.0


It took you almost 4 months to come up with this?
Crawl back under your rock you miserable bitter old man.

I haven't been on Usenet for over 15 months. The provider that I paid for is worthless, like much of what people post on these groups. I can read messages, but no longer post so I used Google Groups.

Take your own advice, Texas is full of rocks.

 

[Fox's Mercantile]

On 4/12/19 12:32 PM, Michael Terrell wrote:
> Take your own advice, Texas is full of rocks.

Go fuck yourself.


--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com