IEC Electropedia
fi        luumen
sv       lumen
en      lumen; lm
de      Lumen n
fr        lumen m
definition
SI unit of luminous flux: Luminous flux emitted in unit solid angle (steradian) by a uniform point source having a luminous intensity of 1 candela
Equivalent definition. Luminous flux of a beam of monochromatic radiation whose frequency is 540 × 1012 hertz and whose radiant flux is 1/683 watt.
Luokitus:
  
Lighting
  
Lähde:
  
IEC Electropedia 2017-10, IEV 845-01-51
  

Tieteen termipankki
fi        luumen
en      lumen
huomautus
lat. lumen = valo, aukko
Luokitus:
  
biologia
  
Lähde:
  
Tieteen termipankki 29.10.2025, Biologia:luumen
  

IATE2
fi        lumen (★★☆☆);
luumen (★★★☆);
lm (★★★☆)
sv       lumen (★★★☆)
en      lumen (★★★★);
lm (★★★☆)
fr        lumen (★★★☆);
lm (★★★☆)
da      lumen (★★★☆);
lm (★★★★)
Luokitus:
  
technology and technical regulations
electronics and electrical engineering
ENERGY
technology
standardisation
  
Lähde:
  
IATE 21.01.2026, Euroopan unioni (1369140)