Thank you very much for reading my post. Actually 220 volts and 440 volts are completely different. You have to select the voltage supply depending on the load. If you give 440 volts supply instead of 220 supply, then the circuit will burn out or any accident may happen. This idea that you have to increase the voltage or give 440 volts supply to light multiple lights is wrong. If you want to light 3,4 bulbs in series, then you have to take high wattage lights. Remember that if you want to light 3,4 lights, then you have to use high wattage lights. I use here 200W light. Since the voltage is divided in series, the light of lights 3,4 will be very low and may not light in many cases. For this, you have to connect in a parallel circuit to light multiple lights.