Hello Sir, can I use combinations of diode, resistor and voltage source to represent my LED? Currently for the two 10W LED, I'm using an ideal diode, resistor of 5.56 ohm and voltage source of 21.4V to model two 10W LEDs. The reason that I use this method instead of the other method of changing the IS, Rs, N value is because I'm able to get a more accurate result using the diode, resistor and voltage source method. Thank you sir for your help.