Advertisements

Archive for November 6th, 2016

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.

Advertisements

Leave a comment