Dry-film HID capacitors have a round shape and can operate at temperatures above 200°F. They are used in standard HID fixtures that don't require high power or high voltage, such as signs, wallpacks, post-top lights, and bollard lights.
Oil-filled HID capacitors have an oval shape and are used in industrial lighting fixtures that require high power and high voltage, such as sporting event lights and area lights. The oil in the capacitors helps to reduce heat and prevent the bulbs from burning out prematurely.
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