About LED indicators and tail-lights

Good Morning

Firstly, may I be excused for this blatant cross-post, however the
discussion that follows may be of interest to readers with regard to the
burgeoning use of Light Emitting Diodes in automotive applications that
spans the gamut of manufacturers...

The item I am going to detail has many other uses in addition to
tail-lights, courtesy lights, indicators et al, including but not limited
to traffic lights - see, this is on topic - IR illumination, industrial LED
signalling applications and many, many more.

Updates and further information may be obtained in other groups including
sci.engr.lighting.

Scenario: You want brake lights to double as tail-lights using the same LED
array, how do you do it?

http://www.geocities.com/ledaccelerator details a new invention that
provides a method to make otherwise dull LED's much brighter, allows LED's
to be used at two luminosity levels so making the ubiquitous LED a lot more
useful...And allows LED's to be overpowered without letting the smoke out
(blowing up).

The invention, or rights to it are for sale probably rendering this post as
an advertisement. In any case I will respond to responsible criticism.

Thank you for your indulgence.

Peter Lowrie
++64-4-9766712

 

And what a load of rubbish it all is.

 

What it sounds like he's doing is using a chopper circuit to run 5V LEDs
on another power source at perhaps a slight overvoltage. It's Voltage
Regulation 101, and really nothing special from what I can tell.

Besides, you can do the two-level brightness thing with a divider
network if you were so inclined. Resistors are cheap.

-lee

 

Faced with coming up with a solution for "visible taillight/bright
brake brakelight combo unit based on LEDs", I'd just go with two
different grids of LEDs. 30% of all LEDs in the housing are ON for the
normal taillight function, the remaining 70% will be switched on once
the brakes are activated.

 

The OP has cross-posted this in many NGs including some electronics ones and
it transpires that he does not even know a basic Ohm's law. He's no doubt
picked up a current pulsing circuit (PWM of some form) from some beginners
guide to electronics book and pretends that its his own 'invention' and is
trying to sell it for a close to a million bucks.
http://www.geocities.com/ledaccelerator/outright.html
What a laugh. In another post he claims to have invented an engine running
on water:
http://www.google.com/groups?q=authoreter+author:lowrie&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=n_1zb.10991%24ws.1019231%40news02.tsnz.net&rnum=3
Come to think of it, our forefathers did that! Its called the water wheel!

 

LEDs can be overdriven significantly with a PWM type supply, as the
AVERAGE current is what is most critical. Higher current short term
pulses make the led much brighter than the lower constant current. The
led does not blow because the AVERAGE current is still less than the
rated current.

 

Clare,

A phenominally astute observation - not one other person has figured this
out. You are to be applauded! But with respect to the way the module works
in practice - that is just less than 1/2 of the equation.

Peter Lowrie

 

You purchase the LED fixture designed to do that particular job. They've
been available here for years.

 

<FMywb.9505$>
<bpue8e$1skdgj$-berlin.de> <>

and his claimed LED Accelerator.

paid,a disposable camera to take photographs of this development.

them with appropriate credit in any commentary I may have on the device.

will include Voltage, Current Lux and nM meter readings with his device
connected.

photographs I obtain available to sci.engr.lighting, sci.electronics.design
and www.candlepowerforums.com

Adam

Peter Lowrie follows up:

http://www.geocities.com/ledaccelerator/9/index.html
....Is what it's all about.

So that's all good and proper, thank you Adam. As it turns out you are not
only a scholar but a gentleman also. Scott Stephens has been scratching his
head, Daniel Stern ever the businessman trusts no-one and Clives LED
teleporter sounds amazing...LOL.

Still a prototype sits atop the oscilloscope over there on the corner of my
table as it has been for about four weeks now shining away in two modes -
'accelerated' and non. Not one LED has gone Poof, snap, crackle or Pop!

Whereas component values won't be displayed, I'll also shoot a temperature
measurement on the bright LED's for you. Adam didn't mention input voltages
which I will be able to show in photographs - that the unit is running from
a 9 volt supply. Hope is I can photograph it all in such a manner as to not
give a secret away and clear enough so that Daniel will be able to trace
the test leads back to instruments thus verifying that no skulduggery is
afoot. I do not want to lead you gentlemen astray and given the pressure
exerted by way of your (and other posters) various dubious assertions of
malfeasance and snake charming, methinks any lesser mortal or fraudster
would have shrunk back into some dark recess, disappearing from view by
now.

You all have available comprehensive information from links on the site
regarding my various exploits, endeavours and accomplishments by way of a
downloadable CV. Terms like; open book, spring to mind.

Oh, by the way, an offer arrived yesterday which I will consider in due
course.

Yours etc
Peter Lowrie

 

How revolutionary. It would look nice next to my worm hole generator on my
work bench. I too have an oscilloscope not only that I know how to use it.
Funny I also got an LED to glow really brightly powered from a 0-30V PSU,
although what that has to do with thermocouples has me and Dr Who at a loss.
A bit of experimentation showed I could get it very bright it only cost me a
few blown LEDs. The reduced life span is not a worry as they are cheap and
last years anyway. A PWM (Pulse Width Modulation) could also do the job a
quite high overvoltage could be achieved and the pulse width changed to
prevent the LED overheating. As Ohms law tells us this will chuck more
current through the device until it melts, shorten pulse width to allow
enough cool et voila. The human eye is all that is required to do the rest.
How do you think a TV works? It is not a steady picture but one dot moved
very quickly, the human eye can only detect flashes of less than 25Hz that
and the phosphor coating so the picture looks steady. After reading this I
tried the same in my garage and blow me down with a feather it works. The
LED is brighter to the human eye. I'll give you $1 for it. Unlike my worm
hole generator which at the moment is only lacking around $25Bn and a
compact singularity power source.
Odd you haven't got funding for this yet is it not. A quick trip to Philips
and a demo should secure funds. Where do you thing they got the idea for
Stargate (tm) the series, after a trip to my garage of course. However
theirs is not real and they had to fudge it with an Alien device to make it
work.
Oh on another note, a friend of mine has a torch that does exactly this to
overdrive an array of LEDs they do flash but most of the time look rock
steady and very bright. It cost only a few $s from Hong Kong.
I hope you find an investor, then I hope they get killed in a freak accident
so they do not pass the stupid or gullible gene on to another generation. Oh
how fickle humans are.

Try harder next time
Dave

 

Thank you David

And, of course, you are not.

2c
PEL

 

Have a more comprehnsive reply but in meantime, your vote counts ;-)

http://www.led-myths.tk

Adam