1. A light in which the total duration of light in each period is clearly longer than the total duration of darkness and in which the intervals of darkness (occultations) are all of equal duration.
2. Commonly used for a single-occulting light.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Level (technician training - WWA)
Latitude (in degrees)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM