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From: Victor Roberts
Organization: Roberts Research & Consulting, Inc.
X-Mailer: Mozilla 4.78 [en] (Win98; U)
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> <3DE4C4C1.50072B92@RobertsResearchInc.com>
Date: Thu, 28 Nov 2002 14:41:56 GMT
NNTP-Posting-Date: Thu, 28 Nov 2002 06:41:56 PST
Bob Wilson wrote:
> >Even though I also disagreed with the original poster that
> >the small aluminum-core PCB would stabilize at 60C, I have
> >found the reference he may have used. There is a small data
> >sheet with the Luxeon logo inside plastic bag with the
> >Luxeon Star/O LED sample I received at Light Fair 2001. It
> >says "For sustained operation please ensure that the unit is
> >properly mounted to a secondary heatsink. The back surface
> >of MCPCB will stabilize at 60C without any additional
> Well, I wouldn't trust it too much. We found that a single Luxeon mounted to
> the ~1" square metal core PCB got significantly hotter than 60, and got
> there pretty fast.
> The Luxeon Line product (12 LEDs mounted on a long metal core board) did a
> little better, but still at 60C the light output has already dropped
> somewhat, and the life will be significantly reduced.
I was simply quoting the information provided on the
datasheet that Lumileds placed inside the plastic bag with
the Luxeon LED. I have no independent confirmation of their
claim. A agree that both light output and life will be
reduced by operating without a heat sink. This was discussed
in another part of this thread.
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