Join Early Retirement Today
Reply
 
Thread Tools Search this Thread Display Modes
LED lamp life
Old 12-23-2016, 11:29 AM   #1
Thinks s/he gets paid by the post
 
Join Date: Nov 2011
Posts: 3,121
LED lamp life

My first LED lamp is dying at age 7 years. It now flickers when turned on and the light output has decreased. The bulb was rated for 50000 hours but I got only 15000 from it. What percent of expected life are others getting from LED lamps?
__________________

GrayHare is offline   Reply With Quote
Join the #1 Early Retirement and Financial Independence Forum Today - It's Totally Free!

Are you planning to be financially independent as early as possible so you can live life on your own terms? Discuss successful investing strategies, asset allocation models, tax strategies and other related topics in our online forum community. Our members range from young folks just starting their journey to financial independence, military retirees and even multimillionaires. No matter where you fit in you'll find that Early-Retirement.org is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with our members, see fewer ads, upload photographs, create a retirement blog, send private messages and so much, much more!

Old 12-23-2016, 12:19 PM   #2
Moderator Emeritus
braumeister's Avatar
 
Join Date: Feb 2010
Location: Flyover country
Posts: 13,200
It's highly variable, but the ones you buy today are much better than what was available seven years ago.
__________________

braumeister is offline   Reply With Quote
Old 12-23-2016, 12:36 PM   #3
Full time employment: Posting here.
 
Join Date: Aug 2014
Posts: 997
I don't keep track of which bulb was bought when. Mine certainly last longer than CFL's! I've had some in landscaping lighting that have been going for about 5 years. They run between 3 and 6 hours per night depending on the season. We replaced the incandescent bulbs that burned out every year.
CRLLS is offline   Reply With Quote
Old 12-23-2016, 12:40 PM   #4
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
Sunset's Avatar
 
Join Date: Jul 2014
Location: Spending the Kids Inheritance and living in Chicago
Posts: 7,143
I don't track them, as they last so long and I only switched over from CFL's in the last 2 or 3 years now that the cost is $2 each or less.

All I know is one was flickering, and I took it out of the lamp, wiped the metal bottom and screwed it back it in and it has worked flawlessly for months.
Sunset is offline   Reply With Quote
Old 12-23-2016, 01:41 PM   #5
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
target2019's Avatar
 
Join Date: Dec 2008
Posts: 5,182
(8) 60-watt equivalent LED bulbs cost about $20 at BJs. Expected life 20,000 hours.

The testing and lighting standards change, so it is hard to tell why one particular bulb failed. How built, housed, temperature, etc. all affect life.

We have a a very old CFL in a table lamp. The fixture is a monstrosity. But it is definitely more than 25 years old. It is not used for more than a few hours each day.
target2019 is offline   Reply With Quote
Old 12-23-2016, 01:53 PM   #6
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
Chuckanut's Avatar
 
Join Date: Aug 2011
Location: West of the Mississippi
Posts: 9,004
Here's what I was told about estimating bulb life. The manufactures set up a test of 100 bulbs, turn them on and start counting the failures. When the failures hit 50, that number of hours is assumed to be the 'average' and is what they publish.

Is the above true? I have no idea.

I do know that most of my CFL's seem to get less than the advertised life, though they still last a lot longer than incandescent bulbs, and use much less electricity. LED bulbs I suspect will vary with the brand since the electronics are often the most vulnerable point from what I understand.
__________________
The worst decisions are usually made in times of anger and impatience.
Chuckanut is offline   Reply With Quote
Old 12-23-2016, 02:24 PM   #7
Moderator Emeritus
braumeister's Avatar
 
Join Date: Feb 2010
Location: Flyover country
Posts: 13,200
Here's an interesting article from the NY Times in 2009:

How Long Did You Say That Bulb Would Last?

Quote:
But what does a 25,000-hour life mean? As it turns out, no one is quite sure yet. The definitions surrounding LED lamps, a nascent technology, are still being made up as we go along.
Quote:
When a manufacturer says that an LED lamp will last 25,000 or 50,000 hours, what the company actually means is that at that point, the light emanating from that product will be at 70 percent the level it was when new.

Why 70 percent? Turns out, itís fairly arbitrary. Lighting industry engineers believe that at that point, most people can sense that the brightness isnít what it was when the product was new. So they decided to make that the standard.
And from another more recent source:
Quote:
Moreover, an LED bulb's lifespan is practically infinite. Manufacturers typically estimate a bulb's lifespan based on three hours of use per day. By that measurement, an LED bulb will be as good as new for at least a decade, manufacturers say. Under the same conditions, an old-fashioned lightbulb may work for only about a year before burning out.
braumeister is offline   Reply With Quote
Old 12-23-2016, 06:23 PM   #8
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
 
Join Date: Sep 2005
Location: Northern IL
Posts: 21,509
Quote:
Originally Posted by Chuckanut View Post
Here's what I was told about estimating bulb life. The manufactures set up a test of 100 bulbs, turn them on and start counting the failures. When the failures hit 50, that number of hours is assumed to be the 'average' and is what they publish.

Is the above true? I have no idea. ...
No, it's not true. It has nothing to do with failures. See braumeister's post about LD70.

And a further clarification. Don't expect the LED bulbs to last anywhere near their LD70 rating. The problem is there are electrolytic capacitors in the switching circuits. Those caps degrade over time, and heat is their enemy. While LEDs produce less heat than a filament bulb, it is still enough, and contained enough when you cram all that in the size of an Edison style bulb, to lower the life of those caps.

I don't have time now, but I could provide some detailed technical articles on those caps and the temperatures in the LED bulbs. It's not a pretty picture.

I'm looking forward to getting past the idea that the LED has to be a direct replacement for the Edison bulb. If we put the power circuitry in the base of the lamp, for example, and just the LEDs where we want light, the heat would be isolated, and all those components will be happier. I plan on building a few of these for myself from components (strip LEDS in a lamp, small/cheap 'wall wart' style power supply in the base. Sometimes, with new technology, you need to break away from the old paradigms.

It's a shame that the marketing of these 'lifetime' ratings is allowed. When you set up someone for this artificial hope, then they are disappointing in the technology, instead of being thrilled with it.

-ERD50
ERD50 is online now   Reply With Quote
Old 12-23-2016, 07:37 PM   #9
Thinks s/he gets paid by the post
RobbieB's Avatar
 
Join Date: Mar 2016
Location: Central CA
Posts: 4,183
I'm thrilled with LED's, they work great and use less energy. The price continues to drop as the tech gets better and the manufacturing gets bigger.

Only 15,000 hours eh? Bummer.

When was the last time a filament bulb lasted that long? And cfl's take an annoying time to get bright.

The future is LED!
__________________
Retired at 59 in 2014. Should have done it sooner but I worried too much.
RobbieB is online now   Reply With Quote
Old 12-23-2016, 07:54 PM   #10
Thinks s/he gets paid by the post
 
Join Date: Nov 2011
Posts: 3,121
Quote:
Originally Posted by RobbieB View Post
Only 15,000 hours eh? Bummer.

When was the last time a filament bulb lasted that long?
For the price of this one LED I could have bought a couple dozen incandescent bulbs, the total of which would have lasted much longer than 15000 hours.
GrayHare is offline   Reply With Quote
Old 12-23-2016, 08:02 PM   #11
Thinks s/he gets paid by the post
RobbieB's Avatar
 
Join Date: Mar 2016
Location: Central CA
Posts: 4,183
By all means then, use incandescent bulbs forever.
__________________
Retired at 59 in 2014. Should have done it sooner but I worried too much.
RobbieB is online now   Reply With Quote
Old 12-23-2016, 08:07 PM   #12
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
 
Join Date: Sep 2005
Location: Northern IL
Posts: 21,509
Quote:
Originally Posted by RobbieB View Post
I'm thrilled with LED's, they work great and use less energy. The price continues to drop as the tech gets better and the manufacturing gets bigger.

Only 15,000 hours eh? Bummer.

When was the last time a filament bulb lasted that long? And cfl's take an annoying time to get bright.

The future is LED!
I agree that LEDS are the future (and pretty good at the present). But don't expect 15,000 hours out of them That's a scam, won't happen (unless maybe it's kept in a -30C environment with plenty of air circulation).

LEDS are still problematic when it comes to dimming. Some work pretty well with some dimmers. The same dimmer may not work with a different LED brand. Color is a bit of a problem still, but getting better.

-ERD50
ERD50 is online now   Reply With Quote
Old 12-23-2016, 08:53 PM   #13
Thinks s/he gets paid by the post
 
Join Date: Feb 2013
Location: Toronto
Posts: 2,140
We had 60 w equivalent LEDs on sale for two months at Costco this fall for 75 cents a bulb. Hard not to bite the bullet at this price point.
6miths is offline   Reply With Quote
Old 12-23-2016, 10:37 PM   #14
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
Sunset's Avatar
 
Join Date: Jul 2014
Location: Spending the Kids Inheritance and living in Chicago
Posts: 7,143
At the rate my CFL's and LED bulbs are lasting, I will never need to buy another..
Sunset is offline   Reply With Quote
Old 12-24-2016, 03:39 AM   #15
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
target2019's Avatar
 
Join Date: Dec 2008
Posts: 5,182
Quote:
Originally Posted by Sunset View Post
At the rate my CFL's and LED bulbs are lasting, I will never need to buy another..
This is something I've noticed. When we moved into our house of many light fixtures, keeping incandescent bulbs in stock was a chore. Now we go long periods, and the stock of CFLs stays constant as I find LEDs that have better form for an application.
target2019 is offline   Reply With Quote
Old 12-24-2016, 04:05 AM   #16
Thinks s/he gets paid by the post
bUU's Avatar
 
Join Date: Dec 2012
Location: Georgia
Posts: 2,219
We lost an LED within a few weeks, and lost another (that had been in another socket) within a few weeks of swapping it with the dead LED. LEDs bulbs are susceptible to vagaries of insult put to them by poor quality lamps, just like any other electrical device. Their average lifespan doesn't take into consideration such imperfections in the environment within which they need to operate.
bUU is offline   Reply With Quote
Old 12-24-2016, 05:40 AM   #17
Thinks s/he gets paid by the post
 
Join Date: Apr 2011
Posts: 2,457
I don't expect to have to change our LED bulbs in our high ceiling recessed lights ever again.
gerntz is offline   Reply With Quote
Old 12-24-2016, 06:33 AM   #18
Full time employment: Posting here.
folivier's Avatar
 
Join Date: Oct 2009
Posts: 766
A couple things I like about LEDs are being able to get different colors of light (we like 4000k), less energy usage, and like gerntz not having to change the bulbs in the 11' ceiling cans as often. Oh yeah and trying to find incandescent bulbs that aren't halogens.
__________________
You do not have a soul. You are a soul. You have a body.
folivier is offline   Reply With Quote
Old 12-24-2016, 07:18 AM   #19
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
travelover's Avatar
 
Join Date: Mar 2007
Posts: 11,484
Quote:
Originally Posted by Sunset View Post
At the rate my CFL's and LED bulbs are lasting, I will never need to buy another..
I'm at that point with my CFLs. Costco had a partnership with the electricity supplier and sold them dirt cheap. I bought about 4 or 5 boxes which now are ironically obsolete as LEDs become cheap. I rarely replace a CFL.
__________________
Yes, I have achieved work / life balance.
travelover is online now   Reply With Quote
Old 12-24-2016, 08:08 AM   #20
Full time employment: Posting here.
 
Join Date: Aug 2014
Posts: 576
Three quick items from an engineer who used and abused LEDs as part of my job for a number of years--

LEDs, properly driven, have their life rated by when light output goes to half. Most will not burn out if driven at reasonable levels.

The LED bulbs you buy have circuits that convert the AC to DC to drive the lamp. There are components in these circuits that will likely fail long before the LEDs.

Lastly, I hate to disparage my profession but seldom are LEDs driven at reasonable levels (you get more light driving them hard). Seldom are the power circuits designed well with lifespan in mind. Many just don't know how to do it and the parts that will last longer cost more. These bulbs are designed for higher output at lower cost and built in countries known for substituting the cheapest part they can find--especially if it is not visible to the customer.

Replaced most of my household bulbs with LEDs and same for my mother. She has had to replace a number of bulbs. CREE had a guarantee so she would call and they sent her a replacement no cost. Most people probably didn't keep the packaging but mother and my wife did. Takes a week or two but those but they will honor the guarantee.
__________________

ArkTinkerer is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Advice please - squeaky lamp Felix Mulier Other topics 8 05-01-2013 07:32 PM
CFL vs LED Light Bulb Thread easysurfer Other topics 20 08-02-2010 02:21 PM

» Quick Links

 
All times are GMT -6. The time now is 08:22 PM.
 
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.