It's purely for fine tuning Ken.  Remember this is art, it doesn't have to
keep to the real world rules.

You might for example use it to highlight a certain object but you don't
want that object to cast a nasty shadow or some other group of objects in
the background.  It does happen, trust me :)

I've used this feature a few times now and it saves having to reposition the
light and then set up another one to light just another object.

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