A lighting apparatus is designed for connecting to an external signal wire. The external signal wire has an end electrode. The lighting apparatus has a light housing, multiple LED chips, a driver component, a printed circuit board, a socket and an elastic clip. The light housing has a light opening and a back cover. The back cover has a cover entrance. The printed circuit board is used for mounting the plurality of LED chips and the driver component. The socket has a guiding entrance aligning with the cover entrance. The end electrode of the external signal wire is inserted into the guiding entrance. The elastic clip has a clip part and an extended part. The extended part is electrically connected to the driver component. The clip part clips the end electrode for forming an electrical connection to the driver component via the extended part.