11-14-2014, 12:07 AM
Morzh's calculation includes a series diode which drops the RMS voltage to 85 V. Then you only need a 57 ohm resistor to drop the remainiing 17 V.
If you use the diode much less power is dissipated in the resistor, so you can use a lower wattage one.
If you use the diode much less power is dissipated in the resistor, so you can use a lower wattage one.