§ 149.751 - Number and location on a platform and SPM.

(a) A platform that is 30 feet or less on any side, or in diameter, must have at least one obstruction light.

(b) An SPM must have at least one obstruction light.

(c) A platform that is more than 30 feet but less than 50 feet on any side, or in diameter, must have at least two obstruction lights that are installed as far apart from each other on the platform as possible.

(d) A platform that is more than 50 feet on any one side must have one obstruction light installed on each corner.

(e) A circular platform that has a diameter of more than 50 feet must have at least 4 obstruction lights that are installed as far apart from each other on the platform as possible.

(f) At least one of the obstruction lights on each platform and SPM must be visible from the water regardless of the angle of approach to the structure.

(g) If a platform or SPM has more than one obstruction light, the lights must all be installed in the same horizontal plane.

(h) Each obstruction light on a platform must be installed at least 20 feet above mean high water.

(i) Each obstruction light on an SPM must be installed at least 10 feet above the water.