How to make a Main Power failure Backup light without dc battery

How to make a Main Power failure Backup light without dc battery.
Main Power failure auto on off backup led light without dc battery.
Today i will show you how to make a main power supply failure backup light for room, automatic on off room emergency backup led light without using battery. with out battery backup room emergency light when main power supply failure, simple and easy led light bulb without battery. light bulb circuit with out using battery. Simple and easy electronics diy projects make at home.
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