Steve,
The modified sawtooth waveform from a dimmer
would seem to stress the metallic filament of a tungsten
bulb more.
Let's compare the waveform of pure D.C., versus a sine wave,
versus a sawtooth wave, each being loaded by a tungsten
wire that provides resistance.
I don't know this, so it's why I'm posting.
Would not the quanta of change, (highest being the sawtooth,
lowest, D.C. ), affect the molecular viability of the filament
in a bulb?
Discounting the inrush parameters, entirely, and applying the
best means of ramping up the filament to operating voltage,
the question focuses on the stress caused a filament by
either a non-oscillating waveform, a smooth waveform or a
waveform with spikes.
Please advise.
Thanks,
Hal
[snip]
What might be the burn out mechanism? The thermal time constant of the
bulb filament is much longer than the 50/60 cycle applied voltage, so I
can't see that it's thermal. Steve
[snip]
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