The metal halide lamp has a high restart voltage value during the ignition operation. A metal halide lamp generally applies a sinusoidal voltage of a power frequency (50 P60 Hz) across the electrodes, so the arc temperature in the lamp and the conductivity of the internal plasma fluctuate periodically as the power supply voltage fluctuates.
When the current crosses zero, the current density decreases due to de-ionization in the lamp, and the conductance drops, so the arc temperature also gradually decreases. In this case, if the lamp is to be re-established again, there must be a very high instantaneous ignition voltage, so that a spike appears in the voltage waveform, and Ur is the restart voltage peak. It is hoped that the restart voltage Ur of the metal halide lamp will be as low as possible. If the Ur value exceeds the power supply voltage, the light will be extinguished (arc-extinguishing).
The magnitude of the restart voltage of the metal halide lamp is related to the type and amount of the metal halide in the lamp, the shape and material of the electrode, and the amount of impurities in the lamp. According to the above analysis, the biggest difference between the metal halide lamp and other high-intensity discharge lamps is that it has a higher starting voltage and restart voltage, so it can ignite the lamp and stabilize it. Without arcing, the matching lighting circuit must be able to provide higher voltage, and there are special requirements for the voltage waveform in order to maintain the normal and reliable operation of the lamp during its lifetime.
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