About LED indicators and tail-lights

Discussion in 'General Motoring' started by Peter Lowrie, Dec 2, 2003.

  1. Peter Lowrie

    Peter Lowrie Guest

    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
     
    Peter Lowrie, Dec 2, 2003
    #1
    1. Advertisements

  2. Peter Lowrie

    pookeybrain Guest



     
    pookeybrain, Dec 2, 2003
    #2
    1. Advertisements

  3. Peter Lowrie

    Peter Lowrie Guest

    Thanks Pookeybrain, I said that.

    Peter Lowrie
     
    Peter Lowrie, Dec 2, 2003
    #3
  4. Peter Lowrie

    Alien Zord Guest

    And what a load of rubbish it all is.
     
    Alien Zord, Dec 3, 2003
    #4
  5. Peter Lowrie

    Lee Cremeans Guest

    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
     
    Lee Cremeans, Dec 3, 2003
    #5
  6. Peter Lowrie

    René Guest

    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.
     
    René, Dec 3, 2003
    #6
  7. Peter Lowrie

    Alien Zord Guest

    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=auth...n_1zb.10991$&rnum=3
    Come to think of it, our forefathers did that! Its called the water wheel!
     
    Alien Zord, Dec 3, 2003
    #7
  8. Peter Lowrie

    clare Guest

    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 , Dec 4, 2003
    #8
  9. Peter Lowrie

    Peter Lowrie Guest

    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
     
    Peter Lowrie, Dec 4, 2003
    #9
  10. Peter Lowrie

    Brian Smith Guest

    You purchase the LED fixture designed to do that particular job. They've
    been available here for years.
     
    Brian Smith, Dec 4, 2003
    #10
  11. Peter Lowrie

    Peter Lowrie Guest

    <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
     
    Peter Lowrie, Dec 6, 2003
    #11
  12. Peter Lowrie

    Dave Wood Guest

    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
     
    Dave Wood, Dec 8, 2003
    #12
  13. Peter Lowrie

    Peter Lowrie Guest

    Thank you David
    And, of course, you are not.

    2c
    PEL
     
    Peter Lowrie, Dec 8, 2003
    #13
  14. Have a more comprehnsive reply but in meantime, your vote counts ;-)

    http://www.led-myths.tk

    Adam
     
    Adam Aglionby, Dec 9, 2003
    #14
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.