Discussion
Match each lamp technology with its spectral character.
List I
A. Incandescent
B. Fluorescent
C. Metal halide
D. White LED
List II
1. a continuum broken by many discrete lines
2. smooth continuum weighted to the red
3. a blue peak with a broad phosphor emission
4. a continuum with strong narrow mercury lines
Answer: C
Correct answer: A-2, B-4, C-1, D-3
Four technologies with four distinct spectral signatures. Incandescence gives a smooth continuum weighted to the red. A fluorescent lamp gives a phosphor continuum with the mercury lines standing out sharply. Metal halide gives a continuum broken by the many lines of its metal additives. And a white LED gives the characteristic blue pump peak with a broad phosphor emission beside it.
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