Date: Sat, 3 Jul 2010 09:12:09 -0700
Reply-To: "Mike \"Rocket J Squirrel\"" <camping.elliott@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "Mike \"Rocket J Squirrel\"" <camping.elliott@GMAIL.COM>
Subject: Re: Switch to LED lighting
In-Reply-To: <AANLkTin4yC9E3OhnxFjHe-MAGoWaJ0DaWXW3JMbxBw4l@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Uh, no ... no it doesn't.
A load resistor in parallel with the LED bulb (by which I mean the lamps
themselves and their current-limiting resistors, all in the same bulb
which goes into the socket) will not take current away from the bulb.
The resistor passes current in inverse proportion to its resistance, (I
= V/R) where R = the resistance, V = the volts (12), and I = the
resulting current.
And the bulb passes its own current in response to the voltage. The
voltage is the same whether the resistor is present or not.
--
Rocky J Squirrel
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Westrailia: (Ladybug Trailer company, San Juan Capistrano, Calif.)
Bend, OR
KG6RCR
Steven Johnson wrote:
> A resistor in parallell with any other resistance or LED actually reduces
> the current over the LED
> depending on the size of the resistor....
>
> On Sat, Jul 3, 2010 at 7:33 AM, Ken Lewis <kdlewis@northstate.net> wrote:
>
>> That is exactly correct. Adding a resistor in parallel to the LEDS
>> increases
>> the current and fixes the problem. I forget what size but it shouldn't be
>> hard to ascertain by trial and error. For a starting value, measure the
>> bulb
>> you remove, then decrease resistance. Pay attention to wattage.
>> Ken Lewis
>> http://neksiwel.20m.com/
>> in statu viae
>>
>>
>> ----- Original Message -----
>> From: "David Beierl" <dbeierl@ATTGLOBAL.NET>
>> To: <vanagon@GERRY.VANAGON.COM>
>> Sent: Friday, July 02, 2010 3:59 PM
>> Subject: Re: [VANAGON] Switch to LED lighting
>>
>>
>> At 03:28 PM 7/2/2010 Friday, Jay lefstein wrote:
>>>> Why/how would led lights confuse the cruise??
>>>>
>>> If a particular cruise control setup detects the current in the
>>> stop-light line to tell that the brakes have been applied, the lesser
>>> current drawn by equivalent LEDs might not trigger the cruise control
>>> to drop out when the brakes are applied.
>>>
>>> Yours,
>>> David
>>> ps -- That's not a good method IMO anyway because the lamps might be
>>> burnt out, circuit bad etc. But it's a lot more convenient than
>>> having to mount a switch at the brake pedal, or install another
>>> hydraulic switch in the master cylinder.
>>>
>>>
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