Luminous Exitance (at a point of a surface)
The quotient of the luminous flux (dF), leaving an element of the surface containing the point, by the area (dA) of that element.
Unit: lumen per square metre (lm/m2)
Note: Formerly Luminous Emittance and, in French, Emittance Lumineuse.
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