tony sayer wrote in :

http://www.telensa.com/systems-produ...s-and-modules/

Round our way we have got lights with a magic eye on the top that can see
when it is getting dark and it switches the lamp on - then in the morning
it sees that the sky is getting light and turns it off. I don't think the
idea has much of a future though - it is too simple.

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DerbyBorn