Abstract

LED as illumination lamps has become popular because of its efficiency to save energy, especially electricity. This lamp can be operated as normal lamp connected to AC power line but if the failure of power line electricity occurs, the lamp is still on for hours depends on battery capacity. This lamp circuits have voltage and resistance sensor in the end of circuit connected to threaded (screw) electrode of the lamp. This paper analyzes the principle and performance of the circuit, especially to voltage and resistance threshold activation, and the other factor that can cause success or failure operation. The analysis concludes that the voltage from power line installation can activate the lamp to bright up and to charge its battery at once. When the supply of power source is failure, it triggers the circuit to keep the lamp on with battery operated, by term and condition applied that the connection to line power installation established. It is caused of resistance sensor that detected no resistance value in loop circuit connection. This lamp will be able to operate correctly in single line load circuit, and only one lamp as line load, no other resistive or inductive load.