Why do some of the outside lights turn off when people get near the lights?
This is the result of a faulty ballast. The faulty ballast usually has a small break in the internal wiring which makes contact when the light is turned on. As the ballast gets hot, the break expands causing the light to go out. After the ballast cools, the lamp relights, and the process starts over. The ballast must be replaced to correct the problem.