From: Watson 'Atto Parsec' Name
Subject: Re: luxeon star leds
References: <3DDD9A57.58900EFB@RobertsResearchInc.com> <email@example.com> <3DDDB646.96D0D9D2@RobertsResearchInc.com> <3DDE7264.CD48F4F8@RobertsResearchInc.com> <firstname.lastname@example.org> <3DDEB081.884EC92A@RobertsResearchInc.com> <3DE03D65.932BF9BF@RobertsResearchInc.com> <3DE15871.EF8FF9EA@RobertsResearchInc.com> <3DE224D3.81EFBA3C@RobertsResearchInc.com>
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Date: Wed, 27 Nov 2002 07:57:59 -0800
NNTP-Posting-Date: Wed, 27 Nov 2002 08:56:16 PST
Organization: InReach Internet
In article ,
email@example.com talked about...
> In article ,
> firstname.lastname@example.org says...
> >In article ,
> >email@example.com talked about...
> >> Ooops, I missed that. But a luxeon without a heatsink would seem to be a
> >> complete waste of an expensive LED. Without a heatsink, it is not
> >> to push it to anywhere near its intended power level, May as well just
> >> ordinary LEDs.
> >The Luxeon has a _built-in_ heatsink. Somewhere I read that it stabilizes
> >at 60 deg without any external HS.
> That is completely incorrect. There are versions of the Luxeon LEDs that
> come mounted to a metal core PCB. This is NOT a heat sink, in fact Lumileds
> strongly warns in its literature (which is posted on their Luxeon website
> for all to see) against operating the LEDs at full power for more than a few
> moments, unless the heat spreader it is mounted to, is itself mounted to a
> PROPER heatsink.
> If you run a Luxeon LED (either the single LED, or the 12-LED Luxeon Line)
> at full power, with only the heat spreader attached, the LED(s) will be
> damaged by overheating in a few minutes. In fact, this is pretty obvious,
> looking at the size of the heat spreader. Taking the single Luxeon with the
> attached ~1" square metal core PCB attached to it, as an example, it is
> obvious by inspection that this will not stabilize at only 60C, when you are
> pumping a Watt into it.
I think you are going to have to eat your words. Victor posted a followup
about that 60 degree statement I made. :-0
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you put NOSPAM in the
Subject: line. alondra101 hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html