Discussion
Which lamp type uses a tungsten filament in a halogen gas fill?
Answer: A
Halogen gas returns evaporated tungsten to the filament, allowing a higher temperature and a brighter whiter light. A plain incandescent bulb runs in vacuum or inert gas and blackens, which makes the last option a real if older technology. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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