Abstract: A photoswitch includes first and second signal sources for outputting first and second input signals that switch between high and low logic states according to intensity of ambient light, and a latch circuit having set and reset nodes coupled electrically and respectively to the first and second signal sources, and an output node coupled electrically to a switch circuit. When the first and second input signals respectively have the high and low logic states, the output node drives the switch circuit to an on state. When the first and second input signals respectively have the low and high logic states, the output node drives the switch circuit to an off state. When the first and second input signals both have the low logic state, the output node maintains the switch circuit at a current one of the on and off states.

Abstract: A lamp device includes a power line and a light bulb socket connected to a light sensitive controller, and a rotary lamp base. The rotary lamp base includes a shell member, a tubular pivot seat, and a retaining unit. The shell member includes a top wall and a peripheral wall, and receives the socket and the controller therein. The top wall is formed with a through hole that has a hole axis. The peripheral wall is formed with a light sensor hole registered with the controller. The retaining unit retains rotatably a lower seat portion of the pivot seat in the through hole so as to permit rotation of the shell member relative to the pivot seat about the hole axis.

Abstract: A lamp device includes a power line and a light bulb socket connected to a light sensitive controller, and a rotary lamp base. The rotary lamp base includes a shell member, a tubular pivot seat, and a retaining unit. The shell member includes a top wall and a peripheral wall, and receives the socket and the controller therein. The top wall is formed with a through hole that has a hole axis. The peripheral wall is formed with a light sensor hole registered with the controller. The retaining unit retains rotatably a lower seat portion of the pivot seat in the through hole so as to permit rotation of the shell member relative to the pivot seat about the hole axis.