http://www.etaplighting.com/uploadedFiles/Downloadable_documentation/docume=
ntatie/whitepaper_LED_EN.pdf

"Early generation and most low power white LEDs typically lose up to 50% of=
=20
their initial lumen output within the first 8,000 - 15,000 hours. Due to=20
improvements in thermal design and improved materials, high quality power=20
LEDs nowadays can have average lumen maintenance4
 of 50 - 70% after=20
50,000 hours of operation."

Samsung fridge here and finally got around to hooking up the water line.
Hope they changed the logic on the ice maker since yours came out.



-----Original Message-----
>From: Bob Blick <bobblick@ftml.net>
>Sent: Jul 4, 2014 4:18 PM
>To: piclist@mit.edu
>Subject: [EE] Aging of blue LEDs
>
>My refrigerator has been set to 4F (freezer) and 38F (refrigerator)
>since it was new, about 5 years ago. Last night I changed the
>refrigerator to 40 and immediately noticed that one segment of the
>display was considerably brighter than the others. That segment was one
>that hadn't been lit for 5 years.
>
>Attached is a picture I took. In real life the difference is even more
>striking.
>
>Five years is over 40000 hours, so it's perfectly reasonable that the
>LEDs have aged, but I've had red and green displays running continuously
>longer than that with no degradation.
>
>I've also seen blue and white(phosphor) LEDs age very quickly running at
>200% of their current rating, in just a thousand hours. But the display
>in this refrigerator is probably running within its design spec.
>
>I can't help thinking that blue LEDs age faster than other colors. If
>anyone has real information on this I'd love to hear.
>
>Thanks, Bob
>
>--=20
>http://www.fastmail.fm - The professional email service
>


--=20
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