Discussion
Which characteristic does a discharge lamp show at switch on?
Answer: C
The metal halides must vaporise, so the lamp takes several seconds to reach full output and settle in colour. That is why discharge lamps are unsuitable for main beam flashing and are paired with a separate halogen unit. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The order in which the effects act is what decides the outcome, so it is worth establishing first. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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