orlywutlol

I think theres resistors on the board itself that limits the voltage the LEDs receive. According to the box in the link i posted its 5 volts. Someone suggested experimenting swapping out different resistors on the board but as to what resistors does what I have no idea. I dont want to mess with it.

HAFenvy

What is probably happening is the circuit is fed 12V through the POT so at full "On" position the circuit is transferring 12V... down the line there will be a resistor in series with the LED to bring its' voltage down to a safe level so say down to 3.5V passing through the LED (being fed the 12V from the POT). As you turn the POT down, the circuit voltage is going down... so say it is now at 10V, you have 10V going into the LED circuit with the resistor and that resistor is still dropping the voltage but now you might have more like 3.0V going to the LED which dims it down. It is all relative to the source voltage being fed to the LED circuit with the LED/Resistor combo.

Without having the unit in hand I can't confirm this but this is the most likely scenario. What you want to do is crank the POT to full on and measure the voltage on the LED - being a super bright blue I would guess in the 3.5 to 4V area. When you turn the POT down, the voltage across the LED will also be going down so the Max position will be your max forward voltage rating on the LED replacement you want.

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