An LDR and preset pot lets you choose the level of darkness at which the relay will energize.
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LDR Relay Switch No.2 - Photograph

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LDR Relay No.2
Schematic
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Circuit Board

This is a photograph of Light Controlled Relay No.2. The LDR and variable resistor let you choose the level of darkness at which the relay will energize. A second version of this circuit - Light Controlled Relay No.1 - will energize the relay when the light level rises.


A Photo Of Ron J's 
Light Controlled 
Relay Circuit No.2


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LDR Relay No.2
Schematic
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