The effect that the flashing of a light has on reducing its apparent intensity as compared to the intensity of the same light when operated continuously or fixed



Related Terms

FIXED AND FLASHING LIGHT

A light in which a fixed light is combined with a flashing light of higher luminous intensity. The aeronautical light equivalent is called UNDULATING LIGHT

ALTERNATING

Referring to periodic changes in color of a lighted aid to navigation. Alternating fixed and flashing light. A fixed light varied at regular intervals by a single flash of greater luminous intensity, with color variations in either the fixed light or flash, or both.

COMPOSITE GROUP FLASHING LIGHT

A light similar to a group flashing light except that successive groups in a single period have different numbers of flashes

LENS

A piece of glass or transparent material with plane, convex, or concave surfaces adapted for changing the direction of light rays to enlarge or reduce the apparent size of objects.

GROUP QUICK LIGHT

A quick flashing light in which a specified group of flashes is regularly repeated

ALTERNATING GROUP FLASHING LIGHT

A group flashing light which shows periodic color change

LOG LINE

  1. A graduated line used to measure the speed of a vessel through the water or to measure the speed of a current, the line may be called a CURRENT LINE. 2. The line secured to a log. long flashing light. A navigation light with a duration of flash of not less than 2 seconds.

FIXED LIGHT

A light which appears continuous and steady. The term is sometimes loosely used for a light supported on a fixed structure, as distinct from a light on a floating support

FIXED AND GROUP FLASHING LIGHT

A fixed light varied at regular intervals by a group of two or more flashes of greater intensity

ULTRA QUICK LIGHT

A navigation light flashing at a rate of not less than 160 flashes per minute.

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