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Discrete LED Aging After Two Decades

While at another Vassar concert, I noticed a manufacturing date stamp on one of the LED exit signs in Skinner Hall:

Exit Sign - Manufacturing date

Exit Sign – Manufacturing date

I like the “Replacement lamp not applicable” line. I wonder how recently they’ve tested the battery for the projected 90 minutes of backup time…

These old LEDs show the expected brightness variations:

Exit Sign - LED aging

Exit Sign – LED aging

So, now you know what your discrete LEDs will look like after two decades of continuous use. That’s if anybody (else) still uses discrete LEDs, of course.

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