The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

The New Hotness

  • 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.