Method for operating high-pressure discharge lamp, lighting apparatus, and high-pressure discharge lamp apparatus

A high-pressure discharge lamp apparatus comprising:

• a socket unit for attaching a high-pressure discharge lamp;
• and
• a lighting apparatus for operating the high-pressure discharge lamp by supplying an alternating current thereto in the case when the high-pressure discharge lamp is attached to the socket unit, the high-pressure discharge lamp having an arc tube in which a halogen material is sealed and a pair of electrode is provided,
• wherein the lighting apparatus includes:
• a voltage detector for detecting a voltage across the pair of electrodes;
• and
• a controller for controlling the alternating current so that, when the voltage detected by the voltage detector decreases below a predetermined level, the alternating current is supplied at a lower frequency than a rated frequency for a predetermined time period.

A high-pressure discharge lamp apparatus comprising:

• a socket unit for attaching a high-pressure discharge lamp;
• and
• a lighting apparatus for operating the high-pressure discharge lamp by supplying a direct current thereto in the case when the high-pressure discharge lamp is attached to the socket unit, the high-pressure discharge lamp having an arc tube in which a halogen material is sealed and a pair of electrode is provided,
• wherein the lighting apparatus includes:
• a voltage detector for detecting a voltage across the pair of electrodes;
• and
• a controller for controlling the direct current so that, when the voltage detected by the voltage detector decreases below a predetermined level, the direct current flows in a reversed direction for a predetermine time period.

A high-pressure discharge lamp apparatus comprising:

• a high-pressure discharge lamp having an arc tube in which a halogen material is sealed and a pair of electrode is provided;
• and
• a lighting apparatus for operating the high-pressure discharge lamp by supplying an alternating current thereto,
• wherein the lighting apparatus includes:
• a voltage detector for detecting a voltage across the pair of electrodes;
• and
• a controller for controlling the alternating current so that, when the voltage detected by the voltage detector decreases below a predetermined level, the alternating current is supplied at a lower frequency than a rated frequency for a predetermined time period.

A high-pressure discharge lamp apparatus comprising:

• a high-pressure discharge lamp having an arc tube in which a halogen material is sealed and a pair of electrode is provided;
• and
• a lighting apparatus for operating the high-pressure discharge lamp by supplying a direct current thereto,
• wherein the lighting apparatus includes:
• a voltage detector for detecting a voltage across the pair of electrodes;
• and
• a controller for controlling the direct current so that, when the voltage detected by the voltage detector decreases below a predetermined level, the direct current flows in a reversed direction for a predetermine time period.