Discussion
Match each lighting technology with its distinguishing requirement.
List I
A. Halogen
B. High intensity discharge
C. Light emitting diode
List II
P. ballast and igniter
Q. clean handling of the quartz envelope
R. heatsinking of the junction
Select the correct match.
Answer: C
Each technology brings its own installation requirement: clean handling, high voltage control gear, and thermal management respectively. Ignoring any of the three shortens the lamp's life dramatically. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The shared behaviour explains why these belong together and the differences explain why both exist.
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