Light activated switch (mains)

How can I construct something like this http://en.wikipedia.org/wiki/File:Streetlight_control.jpg.

An LDR is series with a relay and a power source (battery, etc)...

any part number ?

they are easily available in market. Simply go and ask for an LDR switch with the delay timer...they come in both 220V AC and 12V DC...you can then attach it to any thing according to ur need. They are readily available in Hall Road from Electronics 2000. It hardly costs 200Rs.!

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they are easily available in market. Simply go and ask for an LDR switch with the delay timer…they come in both 220V AC and 12V DC…you can then attach it to any thing according to ur need. They are readily available in Hall Road from Electronics 2000. It hardly costs 200Rs.!
[/quote]

hall road is out of range (On Vespa Scooter without even a trainee licence ) any ideas about yateem khana Electronics market.

hmm! u'll have to search for it...hard to find it there though.! why not try 9no Van instead.!?