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Resistor Value for L.E.D.’s

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=45185
Printed Date: May 18, 2024 at 7:30 AM


Topic: Resistor Value for L.E.D.’s

Posted By: calee4nyaboy
Subject: Resistor Value for L.E.D.’s
Date Posted: December 14, 2004 at 9:44 AM

Hi,
Quick question: I have a bunch of 3 volt LED's and want to run them in my car. I have been told that all you do is attach a resistor onto the leg of each one to get it to work in 12 volt applications.

What resistor value do you use?

Thanks!
John



Replies:

Posted By: QuagmireMan
Date Posted: December 14, 2004 at 10:26 PM
connect them in series of 4. then you dont have to waste the time with resistors.



Posted By: calee4nyaboy
Date Posted: December 14, 2004 at 10:45 PM
yes, you could do 4 in series with no resistor (assuming they are 4 volt LED's)

I found an excellent page on this that answers the question with the equations needed:

https://www.kpsec.freeuk.com/components/led.htm

yippee!


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