Change of season, change of temperature....
The change of temp in the spring and fall seems to always generate a lot of photocell/dusk-to-dawn light service calls. I'm not sure why that is, but don't miss the opportunity!
Resist the urge to look at these calls as a quick twist-lock photocell replacement. These same people need other stuff done, if you just probe a little, I guarantee it. I've been at a few this past month already that only requested a outdoor light fixed, and I was there all day. Ask some questions, and sell, sell, sell!