#luminescence  light not due to incandescence; occurs at low temperatures
  supertype:  visible_light__visiblelight__light__visible_radiation__visibleradiation  (physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window"
  subtype:  bioluminescence  luminescence produced by physiological processes (as in the firefly)
  subtype:  chemiluminescence  luminescence resulting from a chemical reaction as the oxidation of luciferin in fireflies

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