A List of Lights entry (L Fl) is a single flashing light which shows a long flash of not less than __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — 2.0 seconds duration
According to the USCG Light List technical definitions, an 'L Fl' (Long Flashing) light is characterized by a single flash with a duration of at least 2.0 seconds. This distinct, prolonged flash helps mariners differentiate it from standard flashing lights, which have shorter durations.
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