A fluorescent lamp question for the old timers

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Correct me if I’m wrong but as I remember when fluorescent lamps went into common use they used to say that they would last twenty years. Now they’re saying the same thing about LEDs. I was at a store and saw these LED light fixtures, so I asked the guy if he sold the LED light bulbs for them. The salesman said that the LED light bulbs for the fixtures weren’t repla ceable and that the LEDs would last twenty years and I wouldn’t need to replace them but would have to replace the whole fixture when that happens. I bought this cheap multi LED flashlight a few years ago and one of the LEDs has been going out every few months until now I only have one or two of them left that still comes on.
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It sounds as if you are assuming that the LED are the problem. It could be the circuitry, connections, etc.
If this were a non-LED flashlight and the flashlight itself went bad, you probably replace it, but it wouldn't be because of a burnt out LED.
The same thing could be true for the LED fixture.
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On Fri, 23 Aug 2013 12:57:40 +0000 (UTC), DerbyDad03

Well there are only two connections for each LED. And there is no etc.
Also, these lamps could have the same connection problems his flashlight has
I too have LEDs going out in my flashlights but I haven't tried yet to find the problem.
The quetsion with both lamps and flashlights is, How hard will it be to get them apart, and back together again.

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On Friday, August 23, 2013 5:00:52 AM UTC-5, snipped-for-privacy@gmail.com wrote:

Production-line poor soldering is usually the cause...it was with the one I bought.
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Correct me if I'm wrong but as I remember when fluorescent lamps went into common use they used to say that they would last twenty years. Now they're saying the same thing about LEDs. I was at a store and saw these LED light fixtures, so I asked the guy if he sold the LED light bulbs for them. The salesman said that the LED light bulbs for the fixtures weren't replaceable and that the LEDs would last twenty years and I wouldn't need to replace them but would have to replace the whole fixture when that happens. I bought this cheap multi LED flashlight a few years ago and one of the LEDs has been going out every few months until now I only have one or two of them left that still comes on.
Your memory is accurate; but measuring fluorescent lamp life in years is incorrect unless the lamp is burned continuously or you know how many hours/day it's operated. Fluorescent lamp life is rated in hours so is the lamp operated for 1 hour per day or 5 or what? Manufacturers also found out early on with fluorescent lamps that starting the lamp reduces lamp life. More starts = less life, so now manufacturers rate lamp life at (usually) 3 hours/start.
We're going through the same process with LEDs. They're capable of lasting for many years -- think of the LED indicators in cars, household appliances and the like; but every LED bulb or fixture is different and may overheat or overpower the LED so it fails early. Some people have found that LED bulbs don't last very long if they put them inside enclosed fixtures where heat can build up, for example.
The DOE is testing the Philips "L Prize" LED bulb and recently reported that the 200 bulbs on test have now burned for 25,000 hours with no failures and no loss of light output. Maybe that's where the "25 years of life" came from because, typically, a bulb in a home is usually burned about 1,000 hours/year.
Tomsic
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snipped-for-privacy@gmail.com wrote in

OK, you're wrong.

I never heard anyone make that patently absurd claim.
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On Fri, 23 Aug 2013 13:14:14 +0000 (UTC), Doug Miller wrote:

I never heard that either.
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On Friday, August 23, 2013 9:14:14 AM UTC-4, Doug Miller wrote:

It's not even clear to me what he means by "when fluorescent lamps went into common use"? Is that the original tube type fixtures? If so, that must have been a very long time ago, pre 50s I would think.
Or does he mean when CFLs that were developed to replace incandescents went into use?
My memories go back to the 60s and I don't recall any claims of 20 year life for either.
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It's not even clear to me what he means by "when fluorescent lamps went into common use"? Is that the original tube type fixtures? If so, that must have been a very long time ago, pre 50s I would think.
Or does he mean when CFLs that were developed to replace incandescents went into use?
My memories go back to the 60s and I don't recall any claims of 20 year life for either.
Such claims were common in the lighting industry because people were so fed up with the short life of incandescent bulbs -- kind of like now with household incandescent and LEDs.
Fluorescent lamps came out of the lab in 1938 and started appearing in the early 1940s. One of the first major installations was at the NY Worlds Fair in 1939-40; but WWII limited their manufacture and use; so it was the late 1940s before they became common.
Tomsic
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On Fri, 23 Aug 2013 13:14:14 +0000 (UTC), Doug Miller

circline fixture that I threw out because I was sick of it and it was at least 20 years old - and still working - on the original tube. Then they brought out the "green " tubes - and the first 5 or six I bought didn't last a year - - - -. Same with the first CFLs I bought - they went off like popcorn.
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snipped-for-privacy@snyder.on.ca wrote in

Riiiiiiight....
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On Fri, 23 Aug 2013 19:26:41 +0000 (UTC), Doug Miller

I believe it. When my grandmother moved out of her home about 1962, she had an incandescent light in her pantry that had a point on the bulb. When was the last time they sold one of those 1930"s? early 40's? And it still worked fine. A pantry light she probably turned on and off more than once a day,
Unfortunately I left it in my closet when my mother sold our house. That was about 45 years ago. I want to go to the new owners and ask for the bulb. Should I do it?
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Sounds reasonable, to me. Modelled after Grampa Eddie's head?
. Christopher A. Young Learn about Jesus www.lds.org .
On 8/23/2013 5:34 PM, micky wrote:

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On 8/23/2013 11:28 AM, snipped-for-privacy@snyder.on.ca wrote:

We have a Circline fixture in the hall in front of the clothes dryer and it is turned on and off quite a bit. I put a new bulb in it 8 years ago and it's still bright with no blackening around the connector. It's also not a Greenie Weenie light. ^_^
TDD
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I remember those Circline. They were good, but some table lamps didn't fit the bulbs very well.
. Christopher A. Young Learn about Jesus www.lds.org .
On 8/23/2013 6:48 PM, The Daring Dufas wrote:

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On 8/23/2013 6:00 AM, snipped-for-privacy@gmail.com wrote:

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wrote in message
Correct me if I’m wrong but as I remember when fluorescent lamps went into common use they used to say that they would last twenty years. Now they’re saying the same thing about LEDs. I was at a store and saw these LED light fixtures, so I asked the guy if he sold the LED light bulbs for them. The salesman said that the LED light bulbs for the fixtures weren’t replaceable and that the LEDs would last twenty years and I wouldn’t need to replace them but would have to replace the whole fixture when that happens. I bought this cheap multi LED flashlight a few years ago and one of the LEDs has been going out every few months until now I only have one or two of them left that still comes on.
How could ANY type of light be rated in YEARS? Depends on the usage time. WW
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On 8/23/2013 10:43 AM, WW wrote:

I have seen that in advertisements, but the fine print said something about "based on X hours per day use" and other weasel words. If it was in a stairwell that had to be lit all the time, 20 years is about 175,000 hours. That would be about 150 standard incandescent bulbs, or 1460 bulbs made in China.
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Someday I've got to walk through and get a rough idea how many bulbs at church. I replace about one a week, and the facilities guys get the high ones in the gym. Figure out average hours per bulb use. This could be fun for nerds.
. Christopher A. Young Learn about Jesus www.lds.org .
On 8/23/2013 2:53 PM, Ed Pawlowski wrote:

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On 8/23/2013 1:53 PM, Ed Pawlowski wrote:

Rough service 130volt incandescent bulbs sure do last a long time. The rough service bulbs resist vibration which can cause premature failure of a standard lamp but the 130 volt non-rough service bulbs will last a very long time too. When I mentioned vibration, imagine living in an earthquake prone area or someplace where heavy trucks drive by your home every now and then. I'm impressed with my new 12watt LED, 60watt incandescent equivalent bulb in my desk lamp. Because I'm always fiddling with my computer, the lamp which sits on top of the mid-tower workstation, gets knocked off the darn thing sometimes. I've blown both standard incandescent and CFL lamps when it's happened. The LED bulb has, so far, been unaffected by crashing onto the desk. ^_^
TDD
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