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A spectral power distribution describes

  • A.how many lumens of light the source emits in total
  • B.how efficiently the source turns electricity into light
  • C.the colour the source appears to be when viewed directly
  • D.the relative power emitted at each wavelength across the spectrum

Answer: D

Correct answer: the relative power emitted at each wavelength across the spectrum

The spectral power distribution is the complete physical description of a source: how much power it puts out at every wavelength. Everything else - chromaticity, colour temperature, rendering index - is derived from it by weighting and integration, which is why it is the datum from which all colorimetry proceeds.

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