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Keith Nagel wrote:
<blockquote
cite="mid:GCEDLFMCJPKGDEANLEPOMEPPDDAA.NewCandleAdmin@ipdiscover.com"
type="cite">
<pre wrap="">Hi Ron,
First, thanks most kindly for the recommendation on LED's!
If you will, indulge me in another question.
Given that you've been playing with these things for some time,
perhaps you know more about their actual behavior. Specifically,
light output vs current. The typical factory ratings are for
a fixed 20ma current. Is the light output linearly proportional
to current? If ( and probably ) not, are the curves for different LEDs at
least
</pre>
</blockquote>
<font color="#660000"><font color="#990000">Five different researchers
and myself have indeed looked at this from a number of ways.<br>
<br>
Specifically if the LED's are driven from a single frequency oscillator
(with text book sidebands - harmonics) the LED's are somewhat linear in
the window from ~65->100% of rating (optimal) specification. So if a
LED has a spec of say 10mA it should be fairly linear from 6.5mA to
10mA.<br>
<br>
Now when the LED's are driven from a SEC Exciter (bifurcated, negative
resistance, wide band oscillator, similar to Clapp oscillator design)
the results are a whole new ball game. The reason is the wide
bandwidth. Normally a SEC 15-3 properly tuned will have a band width of
>500MHz, with ~5MHz spacing from the primary fundamental. LED's act
very strange when excited in this way. I early on found that they were
'thermal neutral', which does not mean they cooled, but they did not
produce heat in relation to proportional dissipation.<br>
<br>
So what am I saying here? Well if you have a light source of X lumen's
what should be the expected heat output when compared to the input and
the light output. What is seen in LED's when excited from a SEC Exciter
is a light output => input. Do not get this statement wrong or
interrupt it wrong, I am not talking about the so called OU idea. What
is missing in the LED's driven by SEC Exciters is the expected heat.<br>
<br>
Now what you need to understand is that in all the work I have done and
many others, is that we have been able to power over 200 Super White
LED's to equivalent (specification) light output with less than 10mA of
drive current.<br>
<br>
Okay so what does this mean? Well I have an idea an so do many others
that are very, very skilled in electronics, but no 'One' with
credentials that will be accepted by the current community will come
out and state the results.</font><br>
<br>
</font>
<blockquote
cite="mid:GCEDLFMCJPKGDEANLEPOMEPPDDAA.NewCandleAdmin@ipdiscover.com"
type="cite">
<pre wrap="">proportional? What I am ultimately looking for is the most
light output for the least current. Typically I would order
a selection but I'm sure you must have characterized these
things... Likely I will order a selection, but over the
different types rather than just in one color. </pre>
</blockquote>
<font color="#990000">I nor anyone working with me has tried anything
to do with the different colored LED's. I have seen on the net, people
claiming to have seem interesting things using the colors, yet I for
some reason just can not get excited.</font><br>
<blockquote
cite="mid:GCEDLFMCJPKGDEANLEPOMEPPDDAA.NewCandleAdmin@ipdiscover.com"
type="cite">
<pre wrap="">The white
ones are my first choice for aesthetic reasons, although the
last time we all were discussing this w/ respect to your
work, I seem to remember that yellow or green chemistries
were more energy efficient and would be better for what
I want to do. In my case, I'm interested in the DC characteristics.
</pre>
</blockquote>
<font color="#990000">Kiss the DC characteristics goodbye when you are
exciting with a properly tuned SEC Exciter, you enter a whole new world
of which little data exists.<br>
<br>
You really need to look at ESEG, just a simple test could prove worth
while. Really if only someone would put pencil to paper and see what
the field density is like 30cm from a 1W Exciter and attempt to answer
how it can charge 1kF to 140+ volts in under 60 sec. is just the person
I would like to work with.<br>
</font>
<blockquote
cite="mid:GCEDLFMCJPKGDEANLEPOMEPPDDAA.NewCandleAdmin@ipdiscover.com"
type="cite">
<pre wrap="">
K.
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</pre>
</blockquote>
<br>
<br>
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