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'[EE]:: Superb LED technical resource'
2007\09\20@095755 by Russell McMahon

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Superb LED everything page

       http://members.misty.com/don/ledx.html


___________________

I'm interested in trends and current achievements in White LED
efficiencies.
Claims and actual performance can vary both with manufacturers
enthusiasm, test conditions and real world implementations.
It seems unlikely that you'll get over 100 Lumens/Watt with white LEDs
in almost any application.

That said, here's a Cree press release dated September 13th: Note that
these tests are at just over 1 Watt. Cree data sheets generally show
that 3W nominal units have higher efficiencies at reduced power
levels.

___

       http://www.cree.com/press/press_detail.asp?i=1189687350946

   DURHAM, N.C., SEPTEMBER 13, 2007 — Cree, Inc. (Nasdaq: CREE), a
leader in LED lighting components, today announced it has achieved R&D
results of 129 lumens per watt for a cool-white LED and 99 lumens per
watt for a warm-white LED. These are the best results reported for
packaged, high-power LEDs, and they clearly indicate that Cree is
extending its lead in solid-state lighting through its continued
investments in LED technology.

The results have been verified by the National Institute of Standards
and Technology (NIST). NIST’s tests confirmed that the cool-white
(5,813 K) LED produced 135.7 lumens of light output and achieved 129
lumens per watt efficacy. The warm-white (2,950 K) LED produced 104.2
lumens of light output and achieved 99 lumens per watt efficacy. The
institute tests LEDs at 350 mA and measures the output after five
minutes of operation to ensure thermal stabilization.
___
___________________

The brightest and most efficient LEDs and where to get them

       http://members.misty.com/don/led.html



Updated at 17 July 2007 but with links going back over time, he makes
the following observations.


Red LEDs - 42 lumens/watt by Lumileds, 28 by ETG, 22-28 by Avago.
Red-Orange LEDs - 53 lumens/watt by Lumileds, 21-22 maybe now 28.5 by
Avago, 15 by Toshiba.
Truly Orange LEDs - 18-22 lumens/watt by Toshiba, 18-21 lumens/watt by
Avago.
Yellow and "amber" LEDs - 34-35 lumens/watt by Lumileds, 14-16
lumens/watt by Toshiba.
Yellow-Green LEDs - 8 lumens per watt by P. Tec Opto, 3-4 lumens/watt
by Toshiba, but there is a way to get 20-40.
Green LEDs - 25-32+ sometimes 42 lumens/watt by Nichia, already 33 and
soon 65-70 by Cree, 46 by Lumileds, 16-plus probably 20-plus by Toyoda
Gosei and Avago.
Nichia green LEDs get 30-55 lumens/watt at 5 milliamps
Blue-Green LEDs - 25-28 lumens/watt by Nichia, 37 by Lumileds, soon
maybe 41-46 by Cree.
Blue LEDs - 17 to optimistically 30 lumens/watt by Cree, 7.5-8-10
lumens/watt by Nichia, 13 by Lumileds, 5.5-plus by Toyoda Gosei, maybe
Avago - UPDATE 7/17/2007.

White LEDs -

   64-plus by Citizen Electronics,
   as high as 50 lumens/watt by Nichia,
   37 soon 50 by Lumileds,
   23-plus by Osram,
   now as high as 47-69 for ones with new Cree chips - updated
10/9/2006.

2007\09\20@114319 by Mike Hord

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> That said, here's a Cree press release dated September 13th: Note that
> these tests are at just over 1 Watt. Cree data sheets generally show
> that 3W nominal units have higher efficiencies at reduced power
> levels.

FWIW, the Cree LEDs are eye-damage bright.  We've looked at them
some, and if you can figure out a way to cope with the heat and keep
them un-cooked, they're pretty great.

Mike H.

2007\09\20@115247 by Howard Winter

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Mike,

On Thu, 20 Sep 2007 10:43:14 -0500, Mike Hord wrote:

> FWIW, the Cree LEDs are eye-damage bright.  We've looked at them some

I hope you squinted!  :-)

Cheers,


Howard Winter
St.Albans, England


2007\09\21@055655 by Marco Genovesi

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Also SEOUL semiconductors has Power Leds with high brightness
(Z power P4 series seems has 240lm @ 1A and 100 lm/watt efficency at 350ma )

http://www.zled.com

This is one of the possible applications of these leds:

http://www.scurion.ch/


regards
Marco





---------- Initial Header -----------

>From      : spam_OUTpiclist-bouncesTakeThisOuTspammit.edu
To          : "Microcontroller discussion list - Public." .....piclistKILLspamspam@spam@mit.edu
Cc          :
Date      : Thu, 20 Sep 2007 10:43:14 -0500
Subject : Re: [EE]:: Superb LED technical resource







> > That said, here's a Cree press release dated September 13th: Note that
> > these tests are at just over 1 Watt. Cree data sheets generally show
> > that 3W nominal units have higher efficiencies at reduced power
> > levels.
>
> FWIW, the Cree LEDs are eye-damage bright.  We've looked at them
> some, and if you can figure out a way to cope with the heat and keep
> them un-cooked, they're pretty great.
>
> Mike H.
> -

2007\09\21@124025 by Cedric Chang

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> On Sep 21, 2007, at 3:56 AM, Marco Genovesi wrote:
>
>
>
> Also SEOUL semiconductors has Power Leds with high brightness
> (Z power P4 series seems has 240lm @ 1A and 100 lm/watt efficency  
> at 350ma )
>
> http://www.zled.com
>
> This is one of the possible applications of these leds:
>
> http://www.scurion.ch/
>
>
> regards
> Marco
>
>
Where can you by these in the U.S. ?
Cedric

2007\09\21@133125 by Marco Genovesi

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Cedric, sorry but I haven't idea where to buy Seoul power leds in U.S.   Here (in Europe) one seller is  http://www.dotlight.de


regards
Marco




---------- Initial Header -----------

>From      : piclist-bouncesspamKILLspammit.edu
To          : "Microcontroller discussion list - Public." .....piclistKILLspamspam.....mit.edu
Cc          :
Date      : Fri, 21 Sep 2007 10:40:08 -0600
Subject : Re: [EE]:: Superb LED technical resource







{Quote hidden}

> -

2007\09\21@140415 by William \Chops\ Westfield

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On Sep 21, 2007, at 10:14 AM, Marco Genovesi wrote:

> I haven't idea where to buy Seoul power leds in U.S.

You can buy them via china:

http://www.dealextreme.com/details.dx/sku.1445

BillW

2007\09\21@145509 by Brian Kraut

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I bought some recently.  Here are the contact details:

Jason LEE/ General Manager
SSI(Seoul Semiconductot Inc).
Cell: 201 956 3609
Fax: 201 632 4807
EraseMEjasonspam_OUTspamTakeThisOuTseoulsemicon.com

Brian Kraut
Engineering Alternatives, Inc.
http://www.engalt.com

-----Original Message-----
From: piclist-bouncesspamspam_OUTmit.edu [@spam@piclist-bouncesKILLspamspammit.edu]On Behalf
Of William "Chops" Westfield
Sent: Friday, September 21, 2007 2:04 PM
To: Microcontroller discussion list - Public.
Subject: Re: [EE]:: Superb LED technical resource



On Sep 21, 2007, at 10:14 AM, Marco Genovesi wrote:

> I haven't idea where to buy Seoul power leds in U.S.

You can buy them via china:

http://www.dealextreme.com/details.dx/sku.1445

BillW

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