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    Re: led lights
    From: Ken James
    Date: 2003 Nov 26, 20:22 -0600

    >  Interesting. You are flashing the light on for 1/10 of a second, then off
    for 1/10th of a second.
    No, that is optimum. I use a different duty cycle as a comprmise, so I do
    lose some effectivness.
     But the human eye sees flicker (in computer monitors, florescent lights,
    cinema) even at a rate of 60 pulses per second. i.e. some people can readily
    see a monitor flickering when it refreshes 60x per second.
    Actually it depends on whether it is dark or light surroundings, the color
    and intensty of the pulsng sourece, and other things...50HZ is a good
    ballbark fusion rate for this application. Even then there is a slight
    noticable 'buzz' at times...you can even tell the battery voltage level by
    flickng your eyes past the anchor light and seeing the duty cycle! But from
    a longer distance it is not ever really noticable.-Ken

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