A19 dusk to dawn LED (light emitting diode) light bulb. Ideal bulb to provide safety and security, and save energy. Automatically turns the light on at dusk and off at dawn. Features a built-in sensor which detects daylight and turns the bulb on in the evening an off in the morning. Can be used indoors or outdoors. Contains no mercury. 60W Equivalent, Medium (standard) base, Soft White 2700K color, A19 shape. 25000 hour lifespan.