How much darker could the sun get without killing off the plants necessary for the production of oxygen?

So essentially in my story, aliens put something around the sun that doesn't stop all the light from it hitting Earth, but only some of it, effectively dimming the light without outright extinguishing it.

What I'm looking for is a level of reduced brightness that will kill off most crops but leave the plants vital for oxygen still alive. What would this brightness level be, and what would it look like?

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How much darker could the sun get without killing off the plants necessary for the production of oxygen?

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