After a chat with light transport fellows, I realized that it is not a well-known fact even among professionals that the entropy in the optical system cannot decrease (2nd law). That’s why you cannot start a fire from a moonlight using just optics https://what-if.xkcd.com/145/
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This is only true for a point source. But the moon isn't a point source - it has an area that is very significant in this case. So the energy never gets concentrated more than "the surface of the moon". Which isn't very hot.
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So my James Bond villain orbital super-weapon can only on the day side of the planet. Got it!
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Maybe this would be more productive if you actually read the article Anton linked to, which explains all the reasons why what you just said is wrong.
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Just coat the surface in carbon disulfide first.
End of conversation
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Please help us sir. It's so unfair that we have to play on a high ping.pic.twitter.com/BPqVFVdQkq
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(Color temperature is not temperature.)