Here is a schematic of a power failure light circuit. The circuit is using 10 super bright white LEDs which will become activated automatically in the absence mains power. This circuit can also be used as a LED emergency light. The circuit is divided in two stages first stage is a 12

volt power supply circuit and the second stage is an LED light or lamp. The first stage of the circuit is same as we have used in the previous circuit of power failure alarm circuit but I have changed the other part in 10 super bright white LEDs.
The circuit is also using a 12 volt relay between the two stages which will disconnect the 4.5 volt battery from the led lamp circuit when the relay will get power from the 12 volt transformer and in the opposite condition or absence of mains power the relay will become in off state and connect the 4.5 volt battery from the LED light circuit.  





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Power Failure LED Light Circuit