Definition
A long flash is defined as a flash of not less than two seconds duration. LFl 10s, one long white flash every ten seconds, is the classic landfall and safe water buoy rhythm, chosen because a long flash is easier to pick up at extreme range and against a lit shoreline than a short one. The long flash is also the terminal element in the south cardinal rhythms Q(6)+LFl 15s and VQ(6)+LFl 10s.
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