You would never run the mains current for the whole amp THROUGH a light. Think about it, that describes the circuit of the "light bulb limiter" gadget we use.
The light goes ACROSS the mains supply. SO yes, hot and neutral. SInce the light was meant for lower voltage, the resistor drops voltage from the 220v mains to a useful level. SO the resistor is in series with the light, and the whole light plus resistor across mains hot and neutral.