Abstract: A system is provided for detecting the condition of a lamp, activating a permanent memory two-state display of the lamp condition, and displaying said condition during the daylight when no power is connected to the lamp. The system includes an electrical circuit powered by electricity drawn from power lines connected to the lamp such that the circuit is energized only when the lamp is supposed to be lighted. A rectifier transforms the alternating current of the power lines into a direct current for the circuit. The current of the power lines connected to the lamp is detected and measured when the lamp is supposed to be lighted in order to determine the condition of the lamp, and provide an appropriate signal for controlling switches within the circuit. Two alternative current pathways, each including a capacitor and a switch responsive to input from the current sensor, are provided in the circuit.