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From: email@example.com (Dean Wilkinson)
Subject: Re: luxeon star leds
Date: 27 Nov 2002 09:45:49 -0800
NNTP-Posting-Date: 27 Nov 2002 17:45:49 GMT
I don't see why Lumileds claims that you have to use an aluminum core
PCB. I have designed a PCB that uses Lumiled Luxeon emitters that is
a two layer 10 mil thick FR4 board. I have HAL coated copper pads
under the emitters, and corresponding pads on the opposite side of the
PCB. The pads on the opposite side are placed in direct contact with
an aluminum heatsink.
The thermal resistance of the FR4 over the area of the pads is low
enough that the heat generated by the 1 watt Luxeon emitters conducts
through the board into the heat sink. The FR4 provides electrical
isolation of the LED thermal slug per the Lumileds data sheet.
Works quite well...
"James Jackson" wrote in message news:...
> Well, I just checked my notes, and it looks like the company that I am
> working for is able to get the 1-Watt LumiLEDs for about $1.50 each in the
> quantities that they are purchasing them.
> Ultimately, I think that they will get them for around .90 each - in greater
> I helped to design an Aluminum-core PCB to help 'sink' the heat from the
> Emitter-type LumiLEDs.
> Previously, I designed a PCB for the Star-LumiLEDs, and they do seem to get
> a tad warmish.
> James Jackson
> "Watson 'Atto Parsec' Name" wrote in message
> > In article <4qOdndKA8o8vaH2gXTWcow@texas.net>, JOJ@Texas.net talked
> > about...
> > > Just to add a bit of confusion to the mix...
> > >
> > > The company I work for is using these Luxeon Star LEDs.
> > >
> > > I helped design several PC Boards to mount them on.
> > >
> > > I have, so far, designed 4x LED PCBs, 5x LED PCBs, 10x LED PCBs and 12x
> > > PCBs.
> > >
> > > The LEDs do get a tad warmish - but seem to do okay.
> > >
> > > If anyone is interested in obtaining these PCBs, or details on them, I
> > > be able to put you in touch with a fella who would be intrested in
> > > to you.
> > >
> > > BTW: There is a class held by the folks at Luxeon - that may be helpful
> > > some. I know that the fella at the company went to it, and came away
> with a
> > > notebook full of information, and a more clear idea of how these LEDs
> > >
> > > Regards,
> > >
> > > James Jackson
> > > Oztronics
> > I'm interested in when and if they're going to cost less than $16 each.
> > But I'm grateful that one Luxeon Star is 8 times more expensive than a 5
> > LED, but puts out much more than 8 times the light.
> > [snip]
> > --
> > @@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
> > My email address is whitelisted. *All* email sent to it
> > goes directly to the trash unless you put NOSPAM in the
> > Subject: line. alondra101 hotmail.com
> > Don't be ripped off by the big book dealers. Go to the URL
> > that will give you a choice and save you money(up to half).
> > http://www.everybookstore.com You'll be glad you did!
> > Just when you thought you had all this figured out, the gov't
> > changed it: http://physics.nist.gov/cuu/Units/binary.html
> > @@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
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