Discussion
Which lamp uses an arc between electrodes in a gas filled tube?
Answer: A
A discharge lamp strikes an arc through xenon and metal halide vapour, giving far more light per watt than a filament. Xenon filled halogen bulbs genuinely are sold and are often confused with true discharge lamps, which makes the last option a real marketing reality. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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