decalumen

See also: décalumen and deca-lumen

English

Etymology

deca- +‎ lumen

Pronunciation

• (UK) IPA^(key): /ˈdɛkəluːmɪn/

Noun

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 […]