I wanted something so I could have a timer for the outside lights instead of a light switch when I'm away. The lamp that is usually included in this type of socket does not have a timer. I have found that with this adapter I can purchase automatic lightbulbs that glow in the dark and turn off during the day. I always have a light with me, it makes it easier to find the keyhole. I also like the fact that I don't have to worry about the dark when I'm not at home to turn on the lights when it gets dark. The only thing I don't like is that they last too long. Even when it's light outside, they keep working until the early hours of the morning.