From: Watson 'Atto Parsec' Name
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>
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Date: Sun, 24 Nov 2002 13:08:47 -0800
NNTP-Posting-Date: Sun, 24 Nov 2002 15:07:01 PST
Organization: InReach Internet
In article <3DE03D65.932BF9BF@RobertsResearchInc.com>,
Vic@RobertsResearchInc.com talked about...
> Watson 'Atto Parsec' Name wrote:
> > I don't buy this convection from the top because I'm using the Luxeon
> > Star/O which has the whole top of the LED covered by the lens assembly.
> You are certainly entitled to your opinion, but don't you
> think that the lens assembly will have convective losses
> when it gets hot? The lens assembly will, of course, get hot
> under steady state conditions if the metal base is not
> conected to a heat sink. Considering that the lens assembly,
> including its cylindrical holder, has a much greater surface
> area than the top of the "bare" Luxeon Star, the "convective
> effect" should be more pronounced for a Luxeon with the lens
> assembly than for one without.
The heat from the aluminum base will conduct up thru the barel of the lens
assy and be 'convected' away, as much if not moreso than the internal heat.
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