In perimeter lighting, light should be directed away from the protected area (toward potential adversaries) to illuminate potential threats outside the fence or perimeter, making it easier to detect intrusions. Backlighting (placing the source behind the area being monitored) enhances visibility of trespassers without creating glare for security personnel.

A, C, and D correctly describe standard characteristics of perimeter lighting.

B incorrectly suggests the wrong direction for optimal lighting design.