With built-in 15 second gradual dimming, this bulb is the only light that doesn’t leave the room before you do. Put the kids to bed without the harsh darkness of switching off a standard bulb, and navigate hard-to-see spaces after "lights out". Twilight helps you put the kids to bed without the harsh darkness of switching off a standard bulb, and illuminates stairwells and hallways after 'lights out' to help you navigate hard-to-see spaces.