Re: LED Life when overrun

From: Anthony Fremont (spam_at_anywhere.com)
Date: 03/09/05 

Date: Wed, 09 Mar 2005 10:03:39 GMT

"ef" <gef@dh.invalid> wrote in message
news:1gt5g65.18aa3iv1bfrq26N%gef@dh.invalid...

> I know, I know, but I prefer the higher light output, when run at
higher
> voltage, and am prepared to sacrifice most of 100,000 hours life to
> achieve this.
>
> I do not need the leds to function after I'm dead !!
>
> So, higher consumption, brighter output, lower life, within limits,
any
> sugestions as to quantative analysis, no other response needed !!

Basically (much like an incandescent bulb) slightly greater perceived
brightness will result in a dramatically shortened life. If you insist
upon exceeding the specs, you will be "rewarded" with a mediocre
increases in brightness followed by dimming of the bulb (deteriorating
loss of efficiency) and eventual bulb failure.

I suggest you do your own experiments. Start by doubling current over
the max spec and then work your way down. You won't have to wait
anywhere near 100,000 hours for quantitative results. ;-)

Understand that LED's are not voltage operated devices, they are current
operated. You should never apply a voltage without some kind of
resistance to limit the current.

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