The lumen output of LEDs decrease over time. The lifetime usually refers
to the time to some specified depreciation, such as 80% of original
output. Since 20% reduction in lumens is barely noticeable (eyes are not
linear), 10K hours has little to do with the useable life of the
product. Further, that rating is at a specified current and temperature.
So, if the device is not run at maximums, the life extends dramatically.
Conclusion: I expect to be long dead before the display poops out!
73,
Josh W6XU
On 3/11/2013 11:32 PM, Alan Bloom wrote:
The data sheet for the display we're using specifies an LED lifetime
of 10,000 hours minimum. I expect that's probably a conservative
spec. I've had mine on for thousands of hours so far with no
noticeable change.
Alan N1AL
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