The quantity characteristic of radiant flux which expresses its capacity to produce a luminous sensation, evaluated according to the values of spectral luminous efficiency.
Unless otherwise indicated, the luminous flux in question relates to photopic vision, and is connected with the radiant flux in accordance with the formula adopted in 1948 by the Reference: C.I.E.
Unit: lumen (lm)
Reference: C.I.E. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM