GhostLight is a retrofit smart module that transforms existing outdoor garden lights into intelligent security and lighting devices without altering their original design. Installed between the light fixture and the pole, it integrates a discreet camera, smart lighting control, environmental sensing, and connectivity into a single compact unit. The system preserves the architectural aesthetics of decorative outdoor lighting while adding advanced smart home capabilities. Its tool-less plug-in design enables rapid installation and maintenance, and it is available in both Wi-Fi and LAN/PoE versions to support DIY users and professional installers. GhostLight allows existing lighting infrastructure to become connected, intelligent, and remotely manageable without replacing the original luminaire.