A controlled light fixture mounted on a 5-meter pole can illuminate an area 30 meter in diameter.
For security lighting purposes, what would be the proper distance between fixtures?

A.
25 meters

B.
30 meters

C.
35 meters

D.
40 meters

Explanation:
The answer should be 25 meters:
If a lamp provides a 30 foot illumination, the lamps should be placed less than 30 feet apart to
provide an overlap. A 30 meter coverage area mean the next light should be less than 30 meters
away, and the only answer that fits is 25 meters.
Chapter 6, page 459 of Shon Harris CISSP 5th edition book.