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From: Lizard Blizzard
Subject: Re: luxeon star leds
Date: Fri, 22 Nov 2002 07:50:01 -0800
References: <3DDD9A57.58900EFB@RobertsResearchInc.com> <email@example.com> <3DDDB646.96D0D9D2@RobertsResearchInc.com>
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Victor Roberts wrote:
> John Larkin wrote:
>>On Fri, 22 Nov 2002 02:45:37 GMT, Victor Roberts
>>>The thermal resistance to
>>>"free space" of an unmounted device should therefore be
>>>lower than the thermal resistance of a device mounted to a
>>Then why do people buy heat sinks?
> Because use of heat sinks will lower the temperature of the
> junction. Operating without a heat sink will decrease the
> apparent thermal resistance between the junction and the
> heat sink mounting plate on the LED because of the other
> paths available for power loss. Operating without a heat
> sink does not lower the junction temperature, it raises it.
What you really meant is that operating without a heatsink decreases the
thermal conductance, which is the inverse of thermal resistance.
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