I will have to say, If I have to explain photocell timers one more time this season I am going to lose it. It was pretty overcast today, but I really do not understand why people DO NOT UNDERSTAND them. I say, they come at dark, and shut off 6 hours after they come on. ok, they say, have them come on at 5 and shut off at 11. hmm, well, yes, ok, but they don't work that way, I say, they come on at dark, which can be 4:45 or 5:15, then they shut off 6 hours after that. but the questions keep coming-why don't they come on at the same time? they are 5 minutes off. how come my headlights turn them off? something is wrong with the lights since I put a huge plant in front of the timer. that timer did not work so I turned it on. (which they mean, to the setting "on") and on and on. I used to have dozens of digital timers, and I spent dozens of service calls replacing them and dozens of hours reprogramming them behind my guys. no matter how hard I tried, I could not train them to understand the difference between AM and PM. and digital timers die at a rate of 3-5x faster than photocells, and cost 2x as much too. so the photocells fix all that. set it on 6. all the guys can do that. but man, now I spend hours explaining why half the lights are on when they come home from work. or why the timer that came on first goes off first.