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Which problem arises from fitting diode bulbs in a halogen headlamp?

  • A.No problem
  • B.The lamp fails immediately, which occurs because the supply voltage exceeds the rating of the diode assembly fitted
  • C.The beam pattern is wrong and glare is produced
  • D.The lamp is too dim, which follows from the lower power consumption of the diode assembly that has been fitted

Answer: C

The reflector is designed around a filament in a precise position, and a diode source scatters light where it should not go. It is also usually unlawful. Heat management is the other common failure, which makes such retrofits doubly poor practice. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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