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06-15-2004, 10:27 PM
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#1 |
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Barefoot on the Moon!
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LED question
I have two fans with blue LEDs. One I had for a while and the other I bought new. The new fan's LED's were a really bright blue. Much more noticably so than the old fan's. A few months later, they're about the same dullness.
My question is, what happened? Why did the new fan's LEDs "fade"?
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06-16-2004, 12:04 AM
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#2 |
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Member (6 bit)
Join Date: May 2004
Location: Baltimore
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do you clean your case regularly?
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06-16-2004, 12:19 AM
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#3 |
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Barefoot on the Moon!
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Of course
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06-16-2004, 06:10 AM
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#4 |
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Member (10 bit)
Join Date: Mar 2004
Location: Essex, UK
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Well, it could be that the LED's are getting too high a current, whats your +12V from the PSU like (a bit high?)
That may cause progressive burn-out of the LED's over time.
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06-17-2004, 12:09 AM
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#5 |
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Barefoot on the Moon!
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Nope, voltages are good. The 12V line doesn't really stray from 12.023 and the 5V stays at about 4.972
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06-17-2004, 12:23 AM
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#6 |
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Served with Pride
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If the light is still the same intensity, then I would guess the blue coloring is fading. If the intensity is lower, I'd attibute it to reduced voltage (which you say isn't the case) or just general fatigue of the part.
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06-17-2004, 03:55 AM
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#7 |
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Member (10 bit)
Join Date: Mar 2004
Location: Essex, UK
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I've found blue LED's do fade a bit after time, maybe it's something to do with their construction, the colouring isn't defined by the case colour but by the chemical used in the construction so maybe that has something to do with it
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06-17-2004, 09:25 AM
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#8 |
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Gremlin Overlord
Join Date: Apr 2003
Location: Australia
Posts: 2,382
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Blue LEDs are actually the hardest, and the last, colour to be made for LEDs. It's a very interesting story actually, I recommend you look it up if you're interested.
Something I read online about the fading issue is that it's most likely to do with the power supply, rather than the LED itself. However, in your case I'm not so sure. You be the judge of that one |
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