Our house has a few exterior lights. The usual porch lights (front and back) and a security floodlight and sconce light on the garage (as the garage end of the driveway becomes the “pit of eternal darkness” after dusk).
I’ve tried a few different ways of automating when these lights turn themselves on and off. I added photocells to both lights, but found that without direct sunlight the lamps would typically stay on all day. In the case of the garage I added a digital timer, but have to adjust the timing throughout the year to account for sunrise and sunset.
I recently replaced this arrangement for the front porch light with a single Wemo Wifi Light Switch which can be programmed locally according to a schedule, or which can be triggered by the associated If this then that service.
This has worked swimingly so far, and I plan on replacing the photocell/digital timer in the garage with just the Wemo Light switch (this also means I can switch these lights to CFLs instead of incandescents – incandescents were needed for use with the photocell devices to prevent “strobing” where ambient light approaches the on/off value).
It’s also cool because hey….WiFi light switches.