# Dash light color change
**URL:** https://forums.speedlife.net/t/dash-light-color-change/56560
**Category:** NYSpeed Automotive
**Created:** [October 16, 2008, 11:12am UTC](https://forums.speedlife.net/t/dash-light-color-change/56560 "2008-10-16T11:12:44Z")
**Posts on this page:** 10
**Page:** 2
### Author:  [@IanK](https://forums.speedlife.net/u/IanK)
#### Post date: [October 16, 2008, 9:45pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/21 "2008-10-16T21:45:37Z")
> [@Motocrossx23](#):
>
> btw ian do you remember ohm’s law?
small bits, i must admit
---
### Author:  [@Motocrossx23](https://forums.speedlife.net/u/Motocrossx23)
#### Post date: [October 16, 2008, 9:47pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/22 "2008-10-16T21:47:27Z")
how much current (amps) is going to be running from your PS?
---
### Author:  [@IanK](https://forums.speedlife.net/u/IanK)
#### Post date: [October 16, 2008, 9:52pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/23 "2008-10-16T21:52:04Z")
IDK, its a 12V pwr supply
---
### Author:  [@Motocrossx23](https://forums.speedlife.net/u/Motocrossx23)
#### Post date: [October 16, 2008, 9:52pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/24 "2008-10-16T21:52:06Z")
i’m going to bed lol
here:
[http://www.ohmcheck.com/ohmslaw.htm](http://www.ohmcheck.com/ohmslaw.htm)
---
### Author:  [@Motocrossx23](https://forums.speedlife.net/u/Motocrossx23)
#### Post date: [October 16, 2008, 9:52pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/25 "2008-10-16T21:52:23Z")
specs on it?
---
### Author:  [@Motocrossx23](https://forums.speedlife.net/u/Motocrossx23)
#### Post date: [October 16, 2008, 9:57pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/26 "2008-10-16T21:57:47Z")
usually if your running a 12v power supply to standard LEDs, they have a certain amount of resistance of themselves, usually between 3.5 and 4v, so you have to know how many LEDs your going to have in circuit, determine the total amount of resistance from them, find out what the desired LED current needs to be which would be 3.5-4 volts, and then you need to know how many LEDs your going to put in the series to find the voltage drop across the LEDs
---
### Author:  [@IanK](https://forums.speedlife.net/u/IanK)
#### Post date: [October 16, 2008, 9:58pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/27 "2008-10-16T21:58:28Z")
I dont know the current flow though
---
### Author:  [@IanK](https://forums.speedlife.net/u/IanK)
#### Post date: [October 16, 2008, 10:00pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/28 "2008-10-16T22:00:17Z")
> [@Motocrossx23](#):
>
> usually if your running a 12v power supply to standard LEDs, they have a certain amount of resistance of themselves, usually between 3.5 and 4v, so you have to know how many LEDs your going to have in circuit, determine the total amount of resistance from them, find out what the desired LED current needs to be which would be 3.5-4 volts, and then you need to know how many LEDs your going to put in the series to find the voltage drop across the LEDs
Right, the only thing is I’ll need to find the current to determine the remaining resistance
---
### Author:  [@Motocrossx23](https://forums.speedlife.net/u/Motocrossx23)
#### Post date: [October 16, 2008, 10:02pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/29 "2008-10-16T22:02:18Z")
if your running a simple series circuit (power supply \> xxx resistor \> x # of resistors) you can assume the voltage drop is 0, so in that case you’d need a resistor of 600ohms
but idk exactly how you want to wire this up so i cant be certain
---
### Author:  [@IanK](https://forums.speedlife.net/u/IanK)
#### Post date: [October 16, 2008, 10:04pm UTC](https://forums.speedlife.net/t/dash-light-color-change/56560/30 "2008-10-16T22:04:12Z")
Well thanks for the insight, I’ll do my research
[Previous page](https://forums.speedlife.net/t/dash-light-color-change/56560.md?page=1)