I recall some talk about short lifetime of some white LEDs but couldn't
dig it out of the archive.

Now that it's happened to me, suddenly I'm interested :)

I've got some white T1 LEDs from here:

http://www.led-center.com/led/new/white03.htm part number WL3-W15-2500. 

At rated maximum of 30 mA they seem to last about 1000 hours at room
temperature. At 20 mA they last a little longer.

Then they get dim, about 5% of the new brightness. The color stays about
the same. So I assume the phosphor is OK, it's the blue LED that has
weakened.

I've never seen this happen with blue LEDs. Maybe the white phosphor
pollutes the LED?

I haven't had this problem with "name brand" white LEDs.

Anyone see this happen before?

Cheerful regards,

Bob

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