This is a 12 watt LED light bulb that will come on at dusk and automatically turn off at dawn. This lightbulb by Vgogfly and sold by Tophouse is a large size bulb that fits into a regular E26-27 light socket. Even though this light bulb is large it fits perfectly in my outdoor fixtures. I just leave the light switch on all of the time and the bulb does it's job of coming on and turning off. This is a great security feature as it looks like someone is home. This may only be 12 watts but this LED light is super bright it is as bright as a 100 watt incandescent bulb and lights up the entire driveway. I have had a lot of Christmas lights on the outside of my house this season so my bulb comes on once those lights go off.