LED lightbulb life

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Hi All,

I never cared for the CFL bulbs with the slow starting, and I much
preferred the LED lights which were "intstant on".

The life of of LED bulbs is sometimes quoted on packaging as 50,000
hours, which in domestic use ought be "forever".  

However, I've found while the LED bulbs don't actually ever fail,
they just get dimmer and dimmer, until they are useless for purpose.

The LEDS are working fine, but the fluorescent coating, which actually
emits the visible light, wears out much sooner than "forever". :)

What I'm doing is that once the bulbs get too dim to (say) read the
newspaper by then I put them in (say) a toilet or other non-crtical
area where the lack of brightness isn't a problem.

Btw initially I thought either my eyes were failing, or my reading
glasses prescription was now wrong, before discovering it was actually
dim LED bulbs. I put in new LED bulbs and my eyes were working fine
again! The difference in brighness from new to old LED light bulbs was
actually quite startling!

Ross

Re: LED lightbulb life
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Yes, the same applies to CFL bulbs as well (I've got a very dim one
above me right now).

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Re: LED lightbulb life
On Thu, 09 May 2019 23:17:12 GMT, snipped-for-privacy@invalid.invalid (RMD) wrote as
underneath :

Yep, I reckon on about 3 years as average replacement time for daily
used led bulbs in the 8W-15W range, they run too hot to last well
without dimming with use. So if you buy expensive bulbs then the
economics begin to sag a bit! C+

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Re: LED lightbulb life

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https://en.wikipedia.org/wiki/Usenet_quoting

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Re: LED lightbulb life
On Thu, 09 May 2019 23:17:12 GMT, snipped-for-privacy@invalid.invalid (RMD) wrote:

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In my experience the LEDs themselves don't fail.
The power supply is what fails.
You can reuse a failed LED globe by connecting a suitable low
voltage DC power supply directly to the LEDs.

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Re: LED lightbulb life
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That's true for when they stop working altogether, but the LEDs
themselves do loose brightness over time. White ones also become
more yellow.

Of course it could probably be compensated for by running higher
brightness LEDs at lower current to start with, then having the
current limiter slowly allow more current through as the LEDs get
older. There would be a corresponding cost increase for that
feature though.

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Re: LED lightbulb life
RMD wrote:
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in my experience it is the power supplies not the fluorescent coating that
wears out (same with CFL)
Imagine if  LED TV's faded because of "fluorescent coating" there'd be riots
in the streets, people wanting their money back  .

I've pulled apart a few of them, and the LED is practically new but
the switching power supply is gone.

Understandable since they're totally sealed with silicone, & running hot
thus
destined to burn up & fail.
https://imgur.com/a/eOSEnMC

They should be better designed to run cooler, perhaps with heat sink fins,
ventilation holes?  



Re: LED lightbulb life
On 5/10/2019 9:17 AM, RMD wrote:
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I've had el cheapo Aldi LEDs for the last 5 years. In that time one has  
died and I can't see any change in the rest of them, they seem just as  
bright as when new.

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