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Capacitors and Ignitors

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  • MH-xxW A-P-KIT-3-1 Series - main product image
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    Keystone Selectable Wattage 120/208/240/277/480V HID Capacitor Series

    KST-MH-WVARA-P-KIT-3-1-SERIES
    $181.00 - $474.08
    Keystone Selectable Wattage 120/208/240/277/480V HID Capacitor Series groups Keystone models in the same series so customers can choose the needed option without leaving the product page. It is suited for replacement and maintenance work where electrical...
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    $181.00 - $474.08
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  • HPS-xxW R-1-KIT Series - main product image
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    Keystone Selectable Wattage 120V HID Capacitor Series

    KST-HPS-WVARR-1-KIT-SERIES
    $64.92 - $67.31
    Keystone Selectable Wattage 120V HID Capacitor Series groups Keystone models in the same series so customers can choose the needed option without leaving the product page. It is suited for replacement and maintenance work where electrical compatibility...
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    $64.92 - $67.31
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  • HPS-xxW R-1-KIT-A Series - main product image
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    Keystone Selectable Wattage 120V HID Capacitor Series

    KST-HPS-WVARR-1-KIT-A-SERIES
    $72.00 - $80.15
    Keystone Selectable Wattage 120V HID Capacitor Series groups Keystone models in the same series so customers can choose the needed option without leaving the product page. It is suited for replacement and maintenance work where electrical compatibility...
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    $72.00 - $80.15
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  • CAP-xxW MPS Series - main product image
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    Keystone Selectable Wattage HID Capacitor Series

    KST-CAP-WVARMPS-SERIES
    $20.15 - $37.38
    Keystone Selectable Wattage HID Capacitor Series groups Keystone models in the same series so customers can choose the needed option without leaving the product page. It is suited for replacement and maintenance work where electrical compatibility must...
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    $20.15 - $37.38
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  • CAP-xxW MH Series - main product image
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    Keystone Selectable Wattage HID Capacitor Series

    KST-CAP-WVARMH-SERIES
    $15.77 - $41.46
    Keystone Selectable Wattage HID Capacitor Series groups Keystone models in the same series so customers can choose the needed option without leaving the product page. It is suited for replacement and maintenance work where electrical compatibility must...
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    $15.77 - $41.46
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  • CAP-xxW HPS Series - main product image
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    Keystone Selectable Wattage HID Capacitor Series

    KST-CAP-WVARHPS-SERIES
    $15.77 - $40.46
    Keystone Selectable Wattage HID Capacitor Series groups Keystone models in the same series so customers can choose the needed option without leaving the product page. It is suited for replacement and maintenance work where electrical compatibility must...
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    $15.77 - $40.46
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  • Dry Capacitor, 10MFD, 400V
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    Dry Capacitor, 10MFD, 400V

    HLT-CAP/MH175
    $15.60
    Dry capacitor for metal halide lamps, 10 microfarads, 400 volts. Ideal for enhancing performance and efficiency in lighting systems. Key Features and Benefits Enhances performance of metal halide lamps Compact and reliable...
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    $15.60
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  • Oil Capacitor, 24MFD, 480V
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    Oil Capacitor, 24MFD, 480V

    HLT-CAP/MH1000
    $27.20
    High-quality oil capacitor for MH1000 applications, featuring a 24 microfarad capacity and 480V rating for reliable performance. Key Features and Benefits Durable oil-filled design for long-lasting performance 24 microfarad capacity for optimal power...
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    $27.20
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  • Pulse Start Metal Halide Ballast Kit, 150 Watt, 4-Tap
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    Pulse Start Metal Halide Ballast Kit, 150 Watt, 4-Tap

    HLT-IGN/HPS1
    $17.85
    The 150 Watt Pulse Start Metal Halide Ballast Kit by Halco Lighting Technologies is an essential component for lighting systems requiring reliable performance and efficiency. Designed to meet the needs of various lighting applications, this ballast...
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    $17.85
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  • High Pressure Sodium Ignitor, 2-Tap
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    High Pressure Sodium Ignitor, 2-Tap

    HLT-IGN/HPS2
    $17.85
    This High Pressure Sodium Ignitor from Halco Lighting Technologies is designed to ensure reliable ignition and performance for HPS lamps. It is part of Halco's comprehensive range of lighting solutions, known for its quality and innovation. Key Features...
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    $17.85
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Capacitors and ignitors are critical supporting components within HID ballast systems, and they are among the most commonly replaced parts in aging HID lighting installations. Understanding the role of each component helps facility maintenance teams diagnose failures accurately and order the correct replacement parts without replacing the full ballast assembly.

Capacitors in HID systems serve two primary functions: in lag-type magnetic ballast circuits, they correct the power factor to reduce reactive power draw; in some designs, they also contribute to the starting sequence. A failed or degraded capacitor often causes a lamp to cycle on and off (known as cycling) or refuse to restart after a brief interruption, even when the lamp itself is still functional. Ignitors (also called starters) deliver the high-voltage pulse needed to strike the arc in HPS and certain metal halide lamps during startup. When an ignitor fails, the lamp will not start at all. Ignitors are lamp-type specific, so matching the ignitor to the correct lamp type and wattage is essential for reliable operation.

RelightDepot carries replacement capacitors and ignitors for the most common HID ballast configurations used in the field. For the full ballast assemblies that use these components, see our Metal Halide Ballasts and High Pressure Sodium Ballasts sections. To shop all HID ballast types in one place, visit the HID Ballasts parent category. Replacement HID lamps are available in our HID Lamps section.