Performance
3.3 External Light
3.3.1 The light shall be visible on a dark night with a clear atmosphere at a distance of at least 2 miles.
3.3.2 It shall be visible through 360 degrees in a horizontal direction and over as great a segment of the upper hemisphere as is practical when attached to a lifeboat.
3.3.3 In the case of a flashing light it shall flash at a rate of not less than 50 flashes per minute for the first 2 hours of operation.