What are the requirements for lights on a floating hose string?

§ 149.550 What are the requirements for lights on a floating hose string? Hose strings that are floating or supported on trestles must display the following lights at night and during periods of restricted visibility: (a) One row of yellow lights that must be: (1) Flashing 50 to 70 times per minute; (2) Visible all around the horizon; (3) Visible for at least 2 miles (3.7 km) on a clear, dark night; (4) Not less than 1 or more than 3.5 meters (3 to 11.5 feet) above the water; (5) Approximately equally spaced; (6) Not more than 10 meters (32.8 feet) apart where the hose string crosses a navigable channel; and (7) Where the hose string does not cross a navigable channel, there must be a sufficient number to clearly show the hose string's length and course. (b) Two red lights at each end of the hose string, including the ends in a channel where the hose string is separated to allow vessels to pass, whether open or closed. The lights must be: (1) Visible all around the horizon; (2) Visible for at least 2 miles (3.7 km) on a clear, dark night; and (3) One meter (3 feet) apart in a vertical line with the lower light at the same height above the water as the flashing yellow light. Lights on Buoys Used To Define Traffic Lanes