| 							 I haven't done that yet, as I don't have 120v bulbs. I ran two 220v bulbs in series and they glow 4 times dimmer. Really there's nothing interesting about it, because the incandescent bulbs, heater or any resistive load will have the same voltage. The bulb will glow a tiny bit brighter on 50Hz, because the resistor have more time to follow the signal. 
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