We find this efficient emergency lighting system in a 1987 publication. The circuit keeps a battery charged until there is a power cut when it powers a set of lamps if it is dark. Note the types of relays used.
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We find this efficient emergency lighting system in a 1987 publication. The circuit keeps a battery charged until there is a power cut when it powers a set of lamps if it is dark. Note the types of relays used.
