How many lights are required to set up a 'T' light formation?

• A. 4
• B. 5
• C. 6
• D. 7

Answer: (B)

In a T formation, you’re creating a horizontal crossbar at the top and a vertical stem that drops from its center. If you place lights along both lines, you’d think you need three on the vertical stem and three on the horizontal bar. But the top center light is shared by both lines—the intersection point serves as the top of the stem and the middle of the bar. So the total number of distinct lights needed is five (three on the vertical line minus one shared light, plus three on the horizontal line minus the same shared light: 3 + 3 − 1 = 5). This arrangement provides a clear, recognizable T shape from the air for guiding operations.