Discussion
Which lamp aspect does colour temperature describe?
Answer: C
Colour temperature in kelvin describes the tint, with higher figures appearing bluer. For a filament lamp it genuinely is the actual filament temperature, which makes the last option correct for incandescent sources specifically. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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