Alternative term: Brightness (U.S.A.)
The attribute of visual sensation according to which an area appears to emit more or less light.
Note: This attribute is the psychosensorial correlate (or nearly so) of the photometric quantity "luminance".
Reference: C.I.E. (extract)
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