From: John Woodgate
Subject: Re: luxeon star leds
Date: Wed, 27 Nov 2002 17:53:43 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Wed, 27 Nov 2002 22:24:04 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Watson 'Atto Parsec' Name
wrote (in ) about 'luxeon star leds', on Wed, 27 Nov 2002:
>I have mounted my Star/O LEDs on small pieces of metal brackets inside of
>project boxes. They do not have a problem with overheating even tho
>they're totally enclosed. You have to remember that the plastic itself
>conducts heat, as does a PC board.
Yes, but very poorly.
> I have run them at full power for
>perhaps a half hour or more and they don't seem to get hot. On the first
>one I built, I used a piece of 1" wide by 4" long copper, bent into an 'L'
>shape of 1 by 3 inches. It is mounted inside of the box, with the LED
>mounted to the 1" upright part. It barely gets warm. So with later ones I
>made I used a much smaller bracket of aluminum. Works just fine.
The *thickness* matters as well as the area. If you use very thin
material, the area round the device gets hot, but the more distant parts
stay cool. What thickness did you use?
For aluminium, the grade matters as well. The softer the better for the
heat conduction, but very soft stuff is hard to work.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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