Artificial　lighting　accounts　for　a　significant　proportion　(19%)　of　energy　consumption　in　building　environments.　This　large　contribution　calls　for　the　creation　of　energy-efficient　lighting　control　schemes.　In　this　article,　we　present　WinLight,　a　novel　occupancy-driven　lighting　control　system　that　aims　to　reduce　energy　consumption　while　simultaneously　preserving　the　lighting　comfort　of　occupants.　By　leveraging　the　fine-grained　occupancy　information　estimated　by　existing　WiFi　infrastructure　in　a　non-intrusive　manner,　WinLight　computes　an　appropriate　dimming　command　for　each　lamp　based　on　a　novel　lighting　control　algorithm.　A　centralized　lighting　control　system　assigns　these　commands　to　a　zonal　gateway,　and　occupancy-driven　lighting　control　is　achieved　by　actuating　the　brightness　adjustment　with　a　local　controller　integrated　within　each　lamp.　Moreover,　a　WinLight　App　is　designed　to　enable　occupants　to　customize　their　luminance　preferences　and　to　control　nearby　lamps　using　their　mobile　devices.　We　implemented　WinLight　in　a　1500　m2　multi-functional　office　in　Singapore　and　conducted　an　experiment　during　24　weeks.　The　experimental　results　demonstrate　that　WinLight　achieves　93.09%　and　80.27%　energy　savings　compared　to　static　scheduling　lighting　control　scheme　and　PIR　sensor　based　lighting　control　scheme　while　guaranteeing　the　personalized　lighting　comfort　of　each　occupant.　©　2017　Elsevier　B.V.