Say I have 6 LED's in series. Each LED has a voltage drop of 2 volts. If I supply the LED string with exactly 12volts do I still need to use a current limiting resistor? Because 12-12=0 and 0/0.02A = 0

if Vs-vf =0 do I need curent limiting resister?

CrossRoads May 14, 2014, 7:25pm 2

That's 2V at 20mA. What is it at >20mA? Add a resistor to make sure it does not exceed.

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