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Which arrangement lets one discharge lamp serve both beams?

  • A.A bi-xenon lamp with a moving shutter
  • B.Two separate lamps, which is the only arrangement possible because a discharge lamp cannot be dimmed or switched
  • C.A dual filament lamp
  • D.A moving reflector, which alters the direction of the beam and therefore serves both functions from one lamp unit

Answer: A

A solenoid operated shutter cuts the beam pattern for dipped and withdraws for main. Moving the lamp or reflector genuinely is used in some designs, which makes the last option a real engineering approach. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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