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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> <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: Wed, 27 Nov 2002 17:27:50 GMT
NNTP-Posting-Date: Wed, 27 Nov 2002 09:27:50 PST
Watson 'Atto Parsec' Name wrote:
> If you're serious about all this speculation that has been discussed, I
> suggest you assemble a Star/O into a working device and use it, and then
> come back and tell your experiences. I don't think you will then be so
> critical of the heat problem.
The Luxeon datasheet clearly shows the negative effects on
both initial efficacy and lumen depreciation caused by
operating the junction at any temperature over 25C. Of
course it is not possible to hold the junction at 25C
without a refrigerated heatsink, but it could be held to 45C
if the LED is mounted to a good heatsink in ambient air.
I based on the data I posted I no longer believe the Luxeon
will "burn out" if operate only with the MCPBC and no other
heatsink, but I do believe the data published by Luxeon that
both efficacy and lumen maintenance will suffer. "Proof" of
the former can be measured quickly with a good light meter,.
Proof of the later would take a life test of many hours that
I am not interested in conducting (unless of course someone
wishes to support such a study.)
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