NCIDQ IDFX Practice Exam

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What common feature do HID lamps share regarding their operation after being turned off?

They restart immediately
They require time to restart
They do not need a warm-up time
They run cooler than LEDs

The correct answer is: They require time to restart

HID (High-Intensity Discharge) lamps are distinguished by their unique operational characteristics, particularly their behavior after being turned off. When HID lamps are turned off, they need time to cool down and then to restart. This delay is primarily due to the way they generate light: they rely on a gas discharge process that requires the electrodes to cool down sufficiently before they can initiate a new arc. This essential cooling period can vary based on the specific type of HID lamp, but it is a common characteristic across all types, including metal halide and high-pressure sodium lamps. If an HID lamp is turned off and an attempt is made to immediately restart it, the lamp will not relight until sufficient cooling has occurred and the necessary conditions for re-ignition are met. Thus, they inherently share a feature concerning a required downtime before they can operate again, which makes needing time to restart the correct choice.