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I went looking for a 300 ohm resistor, but I can only find 330ohm resistors, will this work ok? I'm not an electrical guy so I have no idea how big of a diff 30 ohms will make. Thanks.
 

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330 ohms should be OK.

Just make sure it's rated at least 1/2 a watt to be safe.
The wattage rating is usually on the resistor package.
If you don't know, ask the sales guy to verify the wattage rating is half a watt on thr resistor.


Here's the technical formula to calculate power draw on a resistor for future reference.
Power(wattage) = (IxI)xR
I = current
R=resistor
VDC=Voltage across resistor
I=VDC/R

~=means approximation
x=means multiply
/=means divide

~10VDC/330 = .0303=I
(.0303 x .0303) = .00091809 x 330 = .3 or ~1/3 of a watt
 

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why do you need a resistor for the k2 halo's do u need them for the matrix halo's as well? don't they come with one in the line.
 

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The K2 halo's don't have a resistor to regulate the current(power).
So, ya they will work without a resistor and probably be a little brighter but will burn out quickly.

An LED/Halo only requires about 2-3VDC.
With out the resistor, your putting 12VDC across the LED/Halo.

It's like leaving your water hose on full blast to water plants in stead of regulating it with one of those regular spouts to get the right amount of water to the plants.

Basically, the resistor limits the amount of power fed to the LED/Halo so they will last longer.

Not sure if the matrix has them built in or not.
 
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