🚀 go-pugleaf

No one asked what kind of LEDs.  Some of the Lumileds LEDs draw up to 500ma
each!  The newer ones can reach 750ma consistently.  I doubt anyone would
use them in a car brake light.. but they are out there and used a lot......
for other applications of course.


"Jerry G." <jerryg50@hotmail.com> wrote in message
news:Rsan9.14070$qh1.1622310@news.ca.inter.net...
> Each LED must have its own series resistor.   Most of these LED's work
> at about 30 to 40 ma with about 1.6 VDC across them.  You should be able
> to use a  320 ohm 1/2 watt resistor in series with each LED if these are
> in the spec range that I used as an example.
>
> LED's cannot be wired in parallel to each other being fed from one
> resistor.  They can not also be wired in series with each other.
>
> --
>
> Greetings,
>
> Jerry Greenberg        GLG Technologies GLG
> ==============================================
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> ==============================================
> "DaveC" <anon@example.net> wrote in message
> news:0001HW.B9C26E7400A7161B165FEAC0@news.covad.net...
> Have assembled an array of LEDs for use as a 3rd brake light in my car,
> configured as 4 rows of 9 jumbo LEDs, as of yet unwired. Of course the
> power
> supply will be 12 volts nominal (13.8 volts, maximum).
>
> My options, as I see them, are:
> 1) Wire individual resistors to each LED based on its operating current
> 2) Wire each row in parallel and connect one resistor based on operating
> current for 9 LEDs
> 3) Install voltage regulator to output voltage (ie, 1.3 volts?) to
> operate
> all LEDs in parallel.
>
> What is the best method to power these from an intermittent (whenever I
> press
> the brake pedal) power source?
>
> Other options for powering this array?
> --
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> Thanks,
> Dave
> ---
> Dave Carpenter
> Sound Logic
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