Yellow LEDs ? « on: April 23, 2023, 06:34:42 PM » Author: wide-lite 1000
With all if the discussions about the purple LEDs lately I figured I mention something I've seen alot lately , lemon yellow LEDs !  My doctor's office has some : https://www.lighting-gallery.net/gallery/displayimage.php?album=5209&pos=20&pid=163547 And last night when I went out for dinner , a significant amount of the 2,700k LEDs in the restuarant were also the same lemon yellow color .  WHY
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	Re: Yellow LEDs ? « Reply #1 on: April 23, 2023, 06:45:56 PM » Author: BT25
This usually happens due to inadequate thermal management, therefore the phosphor coating on the blue LED's degrades quickly.
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	Re: Yellow LEDs ? « Reply #2 on: April 23, 2023, 06:57:02 PM » Author: wide-lite 1000
I'm seeing the yellow ones WAY more than purple and only in 120v commercial settings . THe purple color atleast looks kinda cool , the yellow is just sickening !
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	Re: Yellow LEDs ? « Reply #3 on: April 23, 2023, 07:43:04 PM » Author: BT25
The utility that serves my area has installed 3000K LED cobra's...as they age, they're shifting to around 2500K...they're starting to look like an under driven incandescent.
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	Re: Yellow LEDs ? « Reply #4 on: April 23, 2023, 07:48:23 PM » Author: wide-lite 1000
That would look better than these things ! They look like  a 5,000k LED behind an yellow lens !
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	Re: Yellow LEDs ? « Reply #5 on: April 23, 2023, 07:50:23 PM » Author: BT25
Yeah, that would look awful...
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	Re: Yellow LEDs ? « Reply #7 on: April 23, 2023, 07:53:22 PM » Author: wide-lite 1000
Too bad my camera won't show an acurate depiction !
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	Re: Yellow LEDs ? « Reply #9 on: April 24, 2023, 02:05:08 AM » Author: dor123
I've seen yellowish LED like this brand new: 1. https://www.lighting-gallery.net/gallery/displayimage.php?pos=-182011 2. https://www.lighting-gallery.net/gallery/displayimage.php?pos=-125849 I've also seen yellowish LED because of EOL: 1. https://www.lighting-gallery.net/gallery/displayimage.php?pos=-112463 2. https://www.lighting-gallery.net/gallery/displayimage.php?pos=-222184
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Yellow LEDs ? « Reply #10 on: April 24, 2023, 02:22:37 AM » Author: Medved
Quote from: BT25 on April 23, 2023, 06:45:56 PM This usually happens due to inadequate thermal management, therefore the phosphor coating on the blue LED's degrades quickly. I would not say the phosphor itself, but the material covering it, to me it looks like it had browned out from heat and intensive blue exposure, so starts blocking the direct blue light from the LED die. In any case it is a questionable design indeed.
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	Re: Yellow LEDs ? « Reply #11 on: April 27, 2023, 08:13:09 AM » Author: HomeBrewLamps
Good. Yellow and purple are way more interesting than bland white. I say let more fail!
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Scavenger, Urban Explorer, Lighting Enthusiast and Creator of homebrewlamps