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the duration of light is greater than or equal to 2 seconds, the flashing light may alternatively be classified as a "long flashing light".

If the frequency is greater than or equal to 50 flashes per minute (a period less than or equal to 1.2 seconds), the flashing light may alternatively be classified as a "quick light".

Long flashing light

Long flashing lights are a variant of single flashing lights where the duration of light is within the inclusive range of 2 to 5 seconds. Long flashing lights are abbreviated

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