"Dave Plowman (News)" wrote:
About a couple of years ago I made up some edge lighting for a meter in a
pal's small recording studio. To replace the tiny 24v tungsten which were
forever blowing. Used 9 diffused 5mm white LEDs - 3 each in series and
one series resistor per chain of three setting the current at something
like 3 mA which was plenty bright enough - and the end result was very
even illumination. Much better than the tungsten.

Very unlikely to be the PS as that is used for other indicators too -
which were ok.

Checking things here on my own PS, it's the LEDs themselves which have all
gone low output. Some more than others - but all well down on the spares I
have from the same batch - bought off Ebay. And rather bluer than the new
spares. The series resistors are all in perfect condition - no signs of
ever even having got warm.

I've had the odd LED fail - but never anything like this. Any explanation?

We had two GU10 LEDs that did the same, very much reduced output after
a year or so of use. All the electronics is inside the 'bulb' but I
still don't really understand how they managed to go so much dimmer
without actually failing.


--
Chris Green
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