The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
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> <firstname.lastname@example.org> <3DDDB646.96D0D9D2@RobertsResearchInc.com> <3DDE7264.CD48F4F8@RobertsResearchInc.com> <email@example.com> <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.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup