Abstract
In order to reduce fluctuations of lamp power and maintain constant power in a continuous dimmer circuit in high-pressure mercury discharge lamps, the authors propose to add a supplementary control circuit on the continuous dimmer circuit. This supplementary control circuit is equipped with a photosensor to control the levels of light. Moreover, we connect the by-pass circuit to the tap of ballast which is close to the power source side. The addition of a by-pass circuit, in which circuit constant is adjusted to reasonable value, make it possible to improve power factor and reduce harmonic current.
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