Quantity of Light
The product of luminous flux (F) and its duration (dt).
Symbol: Q Q = ? F.dt
Unit: lumen-second (lm.s), lumen-hour (lm.h)
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