This White LED Emergency light uses a Relay for the automatic working when power fails. When the Mains power is available, the relay allows the battery to charge and when the power fails, the relay switches on the emergency light. Too simple working ,and no complicated circuits. This Circuit is designed on request from Thomas PD.
This simple circuit gives an LED indication when the 6 V emergency lamp battery enters into the deep discharge state. As long as the battery voltage is above 4 volts, LED remains off and it turns on when the battery voltage drops below 4 volts.
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