Light List, ranges, and light characteristics
Exam frequency
65%
Difficulty
3/5
Drill questions
59
Source excerpts
Light List — light-characteristic (Al)
Light List — light-characteristic (Al) Alternating (Al) A light showing different colours alternately. Charted "Al WR" for alternating white and red.
Light List — light-characteristic (FFl)
Light List — light-characteristic (FFl) Fixed and Flashing (FFl) A fixed light with a brighter flash superimposed at intervals. Used on certain channel-edge structures.
Light List — light-characteristic (Fl)
Light List — light-characteristic (Fl) Flashing (Fl) A single flash, regularly repeated, with the duration of light shorter than the duration of darkness. Charted "Fl <colour> <period>s" — e.g. "Fl R 4s" is a red flash every 4 seconds.
Light List — light-characteristic (Fl(3))
Light List — light-characteristic (Fl(3)) Group Flashing — 3 (Fl(3)) Three flashes per group at a fixed period.
Light List — light-characteristic (Fl(4))
Light List — light-characteristic (Fl(4)) Group Flashing — 4 (Fl(4)) Four flashes per group.
Light List — light-characteristic (Iso)
Light List — light-characteristic (Iso) Isophase (Iso) A light with equal periods of light and darkness. Charted "Iso <colour> <period>s".
Try a sample question
A navigator observing a light notes that it shows white for approximately 3 seconds, then red for approximately 3 seconds, cycling continuously with no period of darkness. The Light List characteristic that best matches this observation is which of the following?
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