ukclique > d-i-y

Tim Streater (09.03.2019, 00:07)
A few years back I replaced the GU10s in the kitchen ceiling with LED
ones. These have 20 or so bright LEDs in them behind a diffuser, but
you can still see each LED. Other evening, I noticed that about half
those LEDS were out. Tonight, those LEDs are back on again.

Anyone know anything about failure modes for the jobbies?
Brian Gaff (09.03.2019, 10:17)
When you say half, do you mean half in each lamp or half the lamps
themselves?
Most LEDs just die, so if some work and then fail then come back it sounds
more likely to be a low voltage issue or some other weird problem. Not all
leds seem to work efficiently at the same voltage and current, well not
quite anyway.
I guess it depends on how each is driven in this case.
Brian
The Natural Philosopher (09.03.2019, 10:34)
On 08/03/2019 22:07, Tim Streater wrote:
> A few years back I replaced the GU10s in the kitchen ceiling with LED
> ones. These have 20 or so bright LEDs in them behind a diffuser, but
> you can still see each LED. Other evening, I noticed that about half
> those LEDS were out. Tonight, those LEDs are back on again.
> Anyone know anything about failure modes for the jobbies? I will repeat what a charming sales assistant said in Homebase


"LED bulbs are a work in progress, aren't they?"

Ther is some terrible far east shit out there, and I dont think anyone
has found the 'best' solution yet.
PeterC (09.03.2019, 11:22)
On Fri, 08 Mar 2019 22:07:20 +0000, Tim Streater wrote:

> A few years back I replaced the GU10s in the kitchen ceiling with LED
> ones. These have 20 or so bright LEDs in them behind a diffuser, but
> you can still see each LED. Other evening, I noticed that about half
> those LEDS were out. Tonight, those LEDs are back on again.
> Anyone know anything about failure modes for the jobbies?


Seems as if they're the 'encapsulated' LEDs - horrible things that are OK
for single indicators. You'd be better off with COB or SMD - at least they
aren't 'wrapped up' ready to cook.
The cheap 3-AA-cell torches have 9 LEDs and these do the same. I have a
torch in a fixed location in each room, they're hardly used and yet most of
them have one or more LEDs out.
If yo want to replace them, a lamp with the old 5050 chips is one option -
nice big SMDs that aren't over-driven.
Tim Streater (09.03.2019, 11:22)
In article <q5vsr0$f48$1>, Brian Gaff
<briang1> wrote:

>When you say half, do you mean half in each lamp or half the lamps
>themselves?


Yes, sorry, I wasn't clear. I meant that in one particular LED GU10
lamp, of its 20 or so LEDs, only about 10 were working. The other LED
GU10s in the kitchen were all working normally. Then a day or so later,
that one GU10 has magically fixed itself.
Andy Burns (09.03.2019, 11:42)
Tim Streater wrote:

> in one particular LED GU10
> lamp, of its 20 or so LEDs, only about 10 were working.


They're probably wired as two series strings, and one LED in one half is
close to burning out for good, when it overheats it isolates all the
others in that half, cools down and they come back on with it ...
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