A light control system comprises a light control device and a sensor module configured to detect a motion pattern of a user's hand relative to the entranceway and a light control device. The light control device includes a housing, a proximity sensor configured to detect a position of a door in a vicinity of the entranceway, and a light controller disposed in the housing and communicated with the sensor module and the proximity sensor. The light controller is configured to control the light strip in response to a detected position of the door by the proximity sensor; and control the light strip in response to the motion pattern detected by the sensor module when the door is not detected at a preset opening position or no door is present at the entranceway.