Most modern light fixtures have flush mount ceiling lights accessories. In this configuration, the outlet box and wiring connections are recessed in the ceiling so that the light fixtures supports flush with the roof surface.
Support the installation of flush mount ceiling lights with one hand and unplug the bare earth. Lower attachment to the ground. Hold the replacement accessory to the outlet box and connect the ground wire to wire connector. Pull the wire (neutral) white below the outlet box and remove the screw connector. Connect the white wire to white wire replacement in the match with a connector thread.
Pull the black wire outside the outlet box and remove the screw connector. Connect the black wire to the black wire on the fixture replacement with a threaded connector. Place the new accessory against the outlet box. Screw the nut on the bolt center cap to attach the accessory, and then install the adjacent mounting screws. Screw the nipple to the world or shade on the bolt. Install the bulb or flush mount ceiling lights and shadow world. Restore power to the fuse box or circuit breaker and test the light.