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Visible Lumen Depreciation of a White LED based Indicator I noticed yesterday that after nine years the LED in the num lock indicator on my laptop has faded really noticeably compared to the caps lock and hard disc activity indicators next to it. While they look blue in the photo the LEDs are actually white, they just shine directly through the case of the laptop which is transparent blue. Just thought it was quite interesting to be actually able to see the effect so obviously in person on such an everyday item. These three LEDs looked identical in brightness when the machine was new. Keywords: Lenovo;ideapad;z570;laptop;computer;white;led

Visible Lumen Depreciation of a White LED based Indicator

I noticed yesterday that after nine years the LED in the num lock indicator on my laptop has faded really noticeably compared to the caps lock and hard disc activity indicators next to it.

While they look blue in the photo the LEDs are actually white, they just shine directly through the case of the laptop which is transparent blue.

Just thought it was quite interesting to be actually able to see the effect so obviously in person on such an everyday item. These three LEDs looked identical in brightness when the machine was new.

IMG_20191126_233326.jpg IMG_20191129_074319.jpg IMG_20200406_150458.jpg IMG_20200831_141450.jpg IMG_20200831_141459.jpg
File information
Filename:IMG_20200406_150458.jpg
Album name:Zelandeth / LED Fittings/Lamps
Keywords:Lenovo / ideapad / z570 / laptop / computer / white / led
Manufacturer:Lenovo (host machine anyway)
Type/Model:Z570
Date manufactured:2011
Filesize:129 KiB
Date added:07 Apr, 2020
Dimensions:1145 x 551 pixels
Displayed:25 times
URL:http://80.229.24.59:9232/gallery/displayimage.php?pid=13553
Favourites:Add to Favourites

Comment 1 to 5 of 5
Page: 1

FrontSideBus   [07 Apr, 2020 at 08:20 AM]
Not bad for 9 years though I suppose...
oliver   [07 Apr, 2020 at 11:32 AM]
I was going to upload a picture of something similar on my keyboard. The Num Lock LED is dimmer than the others like yours.
Ash   [07 Apr, 2020 at 03:57 PM]
On my keyboard at work it dropped to 1/5th of the brightness of the caps/scroll lock leds. 2 years old and i shut down the PC at the end of the day so its not on during night or weekends
oliver   [07 Apr, 2020 at 04:00 PM]
What keyboard is it? The Microsoft ones turn the LEDs off when you aren't typing. My Logitech K120 leaves them on all the time, like most keyboards.
Ash   [07 Apr, 2020 at 04:58 PM]
Dell OEM keyboard

Comment 1 to 5 of 5
Page: 1

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