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From: Victor Roberts
Organization: Roberts Research & Consulting, Inc.
X-Mailer: Mozilla 4.78 [en] (Win98; U)
Subject: Re: luxeon star leds
References: <3DDE7264.CD48F4F8@RobertsResearchInc.com> <email@example.com> <3DDEB081.884EC92A@RobertsResearchInc.com> <3DE03D65.932BF9BF@RobertsResearchInc.com> <3DE27C2A.1BE01CFB@RobertsResearchInc.com> <3DE2BA19.D41B05CB@RobertsResearchInc.com> <firstname.lastname@example.org>
Date: Fri, 29 Nov 2002 23:16:47 GMT
NNTP-Posting-Date: Fri, 29 Nov 2002 15:16:47 PST
"Gene S. Snider" wrote:
> 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.
I suggest that you go to www.luxeon.com and download the
datasheet for the Luxeon LED. As you probably know the rated
current of the "1 watt" Luxeon LEDs is 350ma. The typical
forward voltage of the white 1 watt Luxeon is given as 3.42
volts at 350ma. There is also a V/I curve that indicates
that the typical forward voltage for the white "1 watt"
Luxeon is about 3.1 volts at 100ma.
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