Discussion
Which of the following is not required for a high intensity discharge headlamp installation?
A resistor in series with the lamp
A ballast
An igniter
Automatic levelling
Answer: D
A discharge lamp is current controlled by its ballast and needs no series resistor. The ballast, the igniter that strikes the arc, and automatic levelling are all part of a compliant installation. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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