Re: UPDATE LED Life Test at 2 Months

From: Rune Christensen (rune.christensen_at_adslhome.dk)
Date: 07/07/04 

Date: Wed, 7 Jul 2004 09:19:18 +0200

Hello

I have found this link on eBay
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=2020&item=5106449490

He claims that the white leds in the flashlight can last 100,000 hrs. That
means 24/7 in over 10 years.

You can get the flashlight for 15$ with free shipping around the world.

Cheers
Rune

"Kevin McMurtrie" <mcmurtri@dslextreme.com> skrev i en meddelelse
news:mcmurtri-9B28DE.23370306072004@corp-radius.supernews.com...
> In article <10ejul0jvd4ok4c@corp.supernews.com>,
> "Watson A.Name - \"Watt Sun, the Dark Remover\""
> <NOSPAM@dslextreme.com> wrote:
>
> > I I've had the 4 LEDs operating at 25 mA for all of May and June, and
> > the first few days of July. This is about 1500 hours so far. The LEDs
> > are two Nichia NSPW500BS white LEDs, and two white LEDs from Hong Kong
> > that I got off Ebay. All four are in series so there is no doubt that
> > they are all running at exactly the same current.
> >
> > The two Nichias are going strong, with no noticeable signs of dimming.
> > The two Hong Kong LEDs, sad to say, are so dim that they wouldn't make
> > good panel lights, so can't even consider them suitable for
> > illumination. They're really quite dim.
> >
> > Of the hundred Hong Kong LEDs I bought, all I've used have had this
> > dimming problem after a few hundredds of hours, so I decided to put the
> > four on a PS to control the conditions and verify that I'm not imagining
> > things. I think one problem might be that the Hong Kong LEDs use an
> > organic phosphor that degrades faster than Nichia's, and might
> > contaminate the LED chip. But I'm not an expert on this at all, so I'm
> > open to any other ideas.
> >
> > I posted an update of the progress of the dimming at the beginning of
> > last month, and now this one shows that the hong kong LEDs are so dim
> > that it's probably not worth continuing the test. I may solder two more
> > unused hong kong LEDs into the circuit, and start the test again, just
> > for the halibut.
> >
>
> I've had problems with several white LEDs from Fry's Electronics failing
> too. They dimmed after a few months of use then they started blinking.
> It sucks because some are inside a night hiking flashlight to keep it
> glowing while switched off. It's hand crafted inside a tough acrylic
> tube like a ship in a bottle. The LEDs can't be removed. I didn't
> think I'd need to make LEDs replacable.
>
> I'm going back to green LEDs for the next flashlight. 

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.716 / Virus Database: 472 - Release Date: 05-07-2004

Relevant Pages

  • Re: Looking for Best LED Flashlight
    ... Several Survival Flashlight ... 4D cell Mag light with a Krypton bulb. ... batteries or lithium photo batteries. ... LEDs put out blue light Many people find this blue ...
    (alt.home.repair)
  • Re: Flashlight Bulbs
    ... PR-2 bulbs no longer generally available, ... Rayovac contractor' model flashlight keep going and going! ... Dorcy brand ones I have seen at Target with "1-watt" LEDs? ... Meanwhile, I have on hand enough batteries, LEDs, resistors, flashlights ...
    (sci.electronics.misc)
  • Re: ? on small battery operated fluorescents
    ... flashlight and a fluorescent tube down the side, ... I hate to see something running off battery power using a linear ... then the body of the light becomes the heatsink ... When it comes to implementing a driver board and LEDs, ...
    (sci.electronics.basics)
  • Re: Ping Don re. Maglite LED upgrades
    ... I just started using the Nite Ize conversion for AA flashlights. ... method of switching the flashlight on/off, so I didn't use the switch. ... There are 3 LEDs on the module. ... I'm assuming that the N-I circuit may be similar to this pulsating ...
    (rec.crafts.metalworking)
  • Re: suggestions for red light
    ... I wonder how many of us have made our own red lights by putting theater gel or some other red membrane over the lens of a normal flashlight. ... These days with LEDs so cheap it is easy enough to convert any of the tiny cheap torches to use a deep red LED. ... Even so I find that certain cycle back lights with a particularly dark red filter make the best red flashlights. ...
    (sci.astro.amateur)
Loading