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Illuminant E is

  • A.a theoretical equal energy spectrum used for reference
  • B.a fluorescent lamp used widely in commercial premises
  • C.the standard illuminant representing electric light
  • D.the illuminant used for all textile colour assessment

Answer: A

Equal power at every wavelength makes it convenient mathematically. It has no physical realisation and is not used for practical assessment. Its convenience is mathematical rather than practical. No lamp emits equally at every wavelength.

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