Possible compositions of a rogue binary system?

I am attempting to construct a world that is primarily lit by light filtered through and reflected off of a crystalline moon so that, at its brightest, the planet receives about the same amount of light as a full Earth moon, and still has water. To do this, I am deciding whether or not it would orbit a star at all, and ended up with a rogue planet that gets its heat and light from somewhere else. What types of planets could make this possible in a rogue binary system? Would a gas giant and a terrestrial planet work? Two terrestrial planets? Or is there a way to have the light from a star perpetually blocked and dimmed? Thank you!

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Possible compositions of a rogue binary system?

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