Larger obstructions that require more lighting or longer-range identification may use what size rotating beacon with a red lens?

• A. 24 in
• B. 12 in
• C. 36 in
• D. 48 in

Answer: (A)

When marking obstructions, the beacon size is chosen to balance how far the light will be seen with how practical the setup is. For larger obstructions that need more lighting or longer-range identification, a 24-inch rotating beacon with a red lens is a common, effective choice. It provides substantial visibility without the extra size, cost, and maintenance of the largest beacons. A 12-inch unit is typically enough for smaller obstacles, while 36-inch or 48-inch beacons offer even greater visibility but are usually reserved for the tallest or most critical hazards. So the 24-inch option hits a practical middle ground for larger obstructions requiring more than a small beacon but not the largest, red-lens signaling that it marks an obstruction.