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I don't agree. The diode halves the duty cycle, but the voltage is still double the rated voltage of the lamp. If the filament resistance was constant, the power would be doubled. Because the resistance increases with temperature/power, the power to the lamp will be less than double, but more than its rated power output. It may not last long.In theory, yes.
That was for a 110V lamp on a 110V circuit though, wasn't it?I did that with a hard to change porch light. Made it last forever, but it was a bit yellow.
You are correct. My thinking cap was on crooked. For a given resistance the power would be 4 times for a full-wave signal and 2 times for a half-wave signal or the equivalent of applying about 162Vrms to the bulb for a diode in series with 230Vrms. So the bulb would likely burn out in short order, as you noted.I don't agree. The diode halves the duty cycle, but the voltage is still double the rated voltage of the lamp. If the filament resistance was constant, the power would be doubled. Because the resistance increases with temperature/power, the power to the lamp will be less than double, but more than its rated power output. It may not last long.