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a simple transistor, Potentiometer, LDR and a relay would solve the problem. no need of microcontroller.

google for "twilight" or "dusk to dawn light"

Arun

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if u really want to make it complicated , first think of some enhancements u can add or ur project supervisor/examiner will easily see through the ploy.
:-)

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Search the forum for LDR interfacing..
Coding in C or asm?

nice. u can also connect a battery which will get charged from the panel when there is sufficient daylight.
firstly, it is always a good practice to build a rough block diagram on the various input output peripherals to be connected to the uC before starting on the actual schematic.
:-)

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I hate to be negative,
but using a solar panel on a mains powered lamp
may not earn you any marks.

I think you need a more challenging project.

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