It has been consideed that the Whole haeting current for electrodes during lamp operation flows through filament of electrodes. This paper provides a new theory that closed circuits for heating electrode consist of not only a filament, but plasma in the lamp.
The heating current flowing the plasma, so call it, “by-pass current” is investigated in order to make. clear features, in which most of the heating current for electrode in “by-pass current”. Adopting this theory, analysis of seperating and oscillating mechanism of red hot points on the filament of clectrode are achieved.
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