Using a Fuzzy Light Sensor to Improve the Efficiency of Solar Panels Suryono Suryono, Jatmiko Endro Suseno, Ainie Khuriati Riza Sulistiati and Tahan Prahara E3S Web Conf., 31 (2018) 01007 Published online: 21 February 2018 DOI: 10.1051/e3sconf/20183101007