What mechanism could be used to create an eternal night?

My question is how a species, given sufficiently advanced technology - could block out all - or most - visible light to a generally earthlike planet without rendering it uninhabitable.

The only caveat is that this should be a mechanism that could be 'turned off' if the generator were disabled.

edit - as far as not wiping out all life, I'm thinking the plant life is altered to survive on UV, and the atmosphere is engineered to allow more UV through.

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What mechanism could be used to create an eternal night?

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