20ma will work for most regular leds. This led calculator will help you design your led array and choose the best current limiting resistors values. Led Resistor Calculator Led Resistor Calculator Quickar Electronics How To Hook Up Leds Choosing The Going beyond that maximum current even briefly may damage the led internally without any visible signs. Led limiting resistor calculator . Some good values to try. Must calculate the resistor for a led string of 4 green 5mm leds and 12v supply. Led current limiting resistor calculator. Enter the values for your circuit below. Led resistor calculator a current limiting resistor sometimes called a load resistor or series resistor connects in series with a light emitting diode led so that there is a correct forward voltage drop across it. Current limiting resistor calculator for leds. C...