Researchers at the California Lighting Technology Center (CLTC) at the University of California at Davis developed a new approach to daylighting called the Simplified Daylight Harvesting system (SDH) that is easy to install and provides automatic and continuous calibration. The system uses photosensor readings to set lights to on, off, or intermediate levels and gives users the ability to adjust the on and off setpoints to meet their own preferences—a key element in user acceptance of daylight harvesting.