The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: Watson 'Atto Parsec' Name
Subject: Re: luxeon star leds
References: <3DDE7264.CD48F4F8@RobertsResearchInc.com> <firstname.lastname@example.org> <3DDEB081.884EC92A@RobertsResearchInc.com> <3DE03D65.932BF9BF@RobertsResearchInc.com> <3DE27C2A.1BE01CFB@RobertsResearchInc.com> <3DE2BA19.D41B05CB@RobertsResearchInc.com> <email@example.com>
X-Newsreader: MicroPlanet Gravity v2.60
Date: Fri, 29 Nov 2002 14:34:40 -0800
NNTP-Posting-Date: Fri, 29 Nov 2002 15:32:47 PST
Organization: InReach Internet
In article <firstname.lastname@example.org>,
email@example.com talked about...
> A little bit off subject, but close. I bought one of the CMG Reactor
> flashlights in order to get the Luxeon LED. This was a few months
> back when the Reactors first came out. I removed the Luxeon LED and
> installed it in my Princeton Matrix Headlamp. The Matrix uses a
> "charge pump" to supply 3 volts to the led and allows operation using
> two AA cells until the total cell voltage drops to about 1.25 volts
> (total for both cells) Unfortunately the current draw for the Luxeon
> is about 100 ma at 3 volts and the charge pump IC failed after about
> 10 minutes. From that point on I ran the Luxeon directly from the two
> AA cells. I attached my light meter to the end of the headlamp and
> recorded the output for 36 hours. The light output drops off very
> rapidly during the first three hours and then flattens out for the
> next 30 or so hours. Once the terminal voltage drops below 2.25
> volts, the light output is almost unuseable. What I am trying to do
> now is to reinstall a new charge pump IC that will supply about 100 ma
> to the Luxeon. This will allow extended battery operation. I have
> some of the new Linear charge pump SMD IC's, but they are so small
> that I can't work with them. Eventually, I will find a way to solder
> them onto the circuit board.
We go to all the trouble of replacing unreliable incandescents with LEDs,
and instead we get unreliable chips to drive the LEDs. Oh, well..
Check out this URL. http://thelightsite.cruxial.com/mods/mods_index.htm
You might consider using a constant current chip instead of the constant
voltage ones that you've been using.
So far, the Luxeons thast I've built have all been powered by 3 AA cells
and IMHO that's better than two AA cells because it lasts longer. Also
four AA rechargeables work really well.
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
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup