Discussion
Match each CIE standard illuminant with what it represents.
List I
A. A
B. D65
C. D50
D. F11
List II
1. a warmer daylight used in graphic arts
2. a tungsten filament lamp near 2856 kelvin
3. a narrow band triphosphor fluorescent lamp
4. average daylight of about 6504 kelvin
Answer: B
Correct answer: A-2, B-4, C-1, D-3
The four cover the range of practical assessment conditions. A is tungsten at 2856 K; D65 is average daylight at about 6504 K and the textile standard; D50 is a warmer daylight at about 5003 K used in the graphic arts; and F11 is a narrow band triphosphor fluorescent, included because so much retail lighting is of that kind.
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