decalumen

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English[edit]

Etymology[edit]

deca- +‎ lumen

Pronunciation[edit]

Noun[edit]

decalumen (plural decalumens)

  1. A unit of luminous flux equal to ten lumens.
    • 1956, C. van Duijn, Diseases of Fishes, page 149:
      If the aquarium is placed where it receives insufficient daylight, artificial lighting by means of ordinary incandescent lamps should be employed. For good plant growth 2 decalumens of luminous flux per square decimetre of water surface []