Firstly, I'd like to show the lock which I've incorporated into my castle's entrance:
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As you can see, 2 light's on means the door is securely locked.
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Here we see one light off yet the door remains locked.
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Again, another light is off yet the other is on the the door remains locked.
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Finally, both switches are pulled and the door can be breached :)
Next I've taken 2 pictures of what the small town looks like at both night and day in near-enough the same location, showing how light has effected the area mainly.
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Obviously this is a work in progress :)
-Zuk