We all know that LEDs have an extremely long lifetime when compared to an incad, but has anyone actually driven an LED to the point where it had to be replaced? Also, the SF2005 catalog stated that "the usful light for an LED is defined as the calculated time for the light level to decline to 50 percent of its original value" How will we know when it has reached this line? Thanks!!!
After hundreds and thousands of hours on an LED...
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cheesehead
Flashlight Enthusiast
I'd suspect if it's overdriven, yes, it may be "used up". Otherwise, it's like with a fluorescent, sometimes it's hard to know when it's "done".
idleprocess
Flashaholic
Re: After hundreds and thousands of hours on an LE
How will you know? You'll check it on a lightmeter ... or compare a sample with thousands of hours of usage to a new one...
How will you know? You'll check it on a lightmeter ... or compare a sample with thousands of hours of usage to a new one...
PhotonBoy
Flashlight Enthusiast
Re: After hundreds and thousands of hours on an LE
Your lights will be obsolete before they dim to the point where you notice they're dimmer. Do you still use a DOS based computer or a Betamax VCR?
Your lights will be obsolete before they dim to the point where you notice they're dimmer. Do you still use a DOS based computer or a Betamax VCR?
Re: After hundreds and thousands of hours on an LE
I once worked in a lab where we had a team developing lifetime calculating models for LEDs. Those people routinely have driven LEDs do the breaking point, by overdriving it or heating the LED to accelerate the aging. So it's done routinely by manufacturers and scientists. The models are than of course compared to LEDs who aged during normal operation.
I once worked in a lab where we had a team developing lifetime calculating models for LEDs. Those people routinely have driven LEDs do the breaking point, by overdriving it or heating the LED to accelerate the aging. So it's done routinely by manufacturers and scientists. The models are than of course compared to LEDs who aged during normal operation.
NewBie
*Retired*
Re: After hundreds and thousands of hours on an LE
Of course, some implementations do a poor job of keeping the LED cool, then they overdrive it on top of that, so light decrease is going to happen alot sooner than normal
Of course, some implementations do a poor job of keeping the LED cool, then they overdrive it on top of that, so light decrease is going to happen alot sooner than normal
nerdgineer
Flashlight Enthusiast
Thanks nerdgineer, i'll look into the post.
No offense, Photonboy, but I don't actually believe that a light will be obsolete, i mean, it's actually just a tool. Yes there will be new features, but a light unlike a computer does not have the upgrade-software-upgrade-hardware process. Just as if you were using a using a 20 year-old screwdriver. As long as cr123 cells don't die, neither will lights that use them. /ubbthreads/images/graemlins/nana.gif
No offense, Photonboy, but I don't actually believe that a light will be obsolete, i mean, it's actually just a tool. Yes there will be new features, but a light unlike a computer does not have the upgrade-software-upgrade-hardware process. Just as if you were using a using a 20 year-old screwdriver. As long as cr123 cells don't die, neither will lights that use them. /ubbthreads/images/graemlins/nana.gif
ACMarina
Flashlight Enthusiast
Re: After hundreds and thousands of hours on an LE
I still use a Beta VCR. .
I still use a Beta VCR. .
GarageBoy
Flashlight Enthusiast
Re: After hundreds and thousands of hours on an LE
I got vintage footage on Beta
I got vintage footage on Beta
