LED resistance

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=49260
Printed Date: May 05, 2025 at 10:20 PM

Topic: LED resistance

Posted By: 44dawgs
Subject: LED resistance
Date Posted: February 03, 2005 at 10:34 AM

could anyone tell me what should be the value of a resistance for a high intensity LED? i'm going to use to light a few acrylic panels in my install.

thanks for your help.

Replies:

Posted By: xetmes
Date Posted: February 03, 2005 at 12:11 PM

huh? what do acrylic panels have to do with the resistance of an LED?

LEDs do not have a specific resistance, they are non-linear devices.

ohh wait i reread that you want the resistor to put in series with the LED? how much current can it handle?

Posted By: BaggedTruck
Date Posted: February 04, 2005 at 12:38 AM

if you are going to wire up some LED's on 12 volt--depending on the voltage each requires - thats what determines you resistance. if you have LED's that require 3.3-3.5v you'd need about a 330 ohm resistor to run them on 12 volts. Here is a link to a resistance calc..........https://www.ledsupply.com/reca.html.......just cut/paste...and when you calculate 12v, you should really up it to around 13.4.

-Nick

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Don't hop it...Bodydrop it

Posted By: 44dawgs
Date Posted: February 07, 2005 at 7:57 PM

thanks a million! i should have been more specific, yes, I used a 330 ohm resistor, it worked out grand. I'll post some pics when I'm done!!

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