Led nameplate manufacturers are obliged to calculate what would be the resistor value to be connected in series to use when working with several LEDs in creating LEDs.This software is quite easier this job.How many LEDs will connect as serial, how many units will be parallel arm, what will be the resistor values of the parallel arms.This software calculates for you and draw the circuit.Circuit resistors is displayed on the standard resistor value.Calculate the power consumed by the circuit and the current drawn by the circuit.