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clipka <ano### [at] anonymousorg> wrote:
>
> To limit the light to, say, between 40 to 50 degrees, you could create a
> spotlight with a 50 degree angle, and another spotlight with a 40 degree
> angle and /negative/ brightness.
>
That's an interesting concept: 'negative' light, to subtract from another light.
Such an idea never occured to me, one worth checking out; thanks.
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