Automatic controller for lighting energy saving

The utility model discloses an automatic controller for lighting energy saving. Ambient light can be gathered by a high-speed photoelectric sensitivity sensor through adjusting a photosensitive window of a glass convex lens; a spectrum analysis system analyses and calculates the gathered signals and judges the spectrum and intensity of the light. If the spectrum received by the sensor has a sunlight component and reaches the set closed point of a switch, the switch is switched off, and the lighting system is closed; if the spectrum received by the sensor has a sunlight component and is less than or equal to a set open point of the switch, the switch is switched on, and the lighting system is opened; therefore, the problem that lighting in plants can be automatically controlled is intelligently solved.