Discussion
Which component does a discharge lamp require that a halogen does not?
Answer: B
The arc needs many kilovolts to strike and then a controlled current, which the ballast provides. Discharge lamps actually run cooler than halogens for the same light, so the last option inverts the relationship. Naming what changes and what stays the same is the reliable route through questions of this shape. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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