I want to a light operated switch to one of the outdoors light. It will be something similar to this http://en.wikipedia.org/wiki/File:Streetlight_control.jpg

 

This one above is Thermo-Bimetallswitch solution. I don't know where you can get the Thermo-Bimetallswitch. It would be better use some solution which draws switching energy from switched circuit.

http://www.google.cz/images?um=1&rls=org.mozilla%3Acs%3Aofficial&biw=1272&bih=857&tbs=isch%3A1&sa=1&q=light+operated+switch&aq=f&aqi=&aql=&oq=

 

The streetlight uses a purpose-built sensitive relay that is used to switch a heavier device to turn the streetlamp on.

You do not give any parameters, but the circuit at the link might work - http://www.coolcircuit.com/circuit/light_switch/index.html

Make sure the relay contacts can carry the load current.

 

I will run a 18W to 24W CFL http://en.wikipedia.org/wiki/Compact_fluorescent_lamp at 220-240V. I will post the exact current later on. Also please recommend any part numbers.