I love these lightbulbs! Great lightbulb replacement. The sensor from dusk to dawn works perfectly!. It's simple: change the lightbulb, leave the wall switch on, and they come and go as promised. In fact, they worked so well in our front lights that I bought a second set for the back of our house. Work up or down in sockets, these must be in protected brackets. Mine have showcases. The light sensors work great, we have a built in door at the front of our house so there is usually less natural light coming in. At first I was worried it would turn on when it gets cloudy or the sun starts to get twilight, but even on a darker, overcast, rainy day it won't turn on until the natural daylight fades significantly. They are very bright and illuminate the entire facade of our house. Ideal for safe lighting as they illuminate a large area.