A sensor light bulb is an integrated lighting solution that combines a standard LED lamp with a built-in detection module, typically using Passive Infrared (PIR) or microwave radar technology. These bulbs are designed to automatically illuminate when they detect motion or a change in ambient light levels (dusk-to-dawn) and turn off after a set period of inactivity. This “smart” functionality eliminates the need for manual switches, making them an efficient choice for enhancing home security and reducing energy consumption in transit areas like hallways, porches, and garages.