That would mean that the planet would have to be close enough to reflect enough light to illuminate the station.

Which would mean it would also reflect the light onto the moon, meaning that if the Death Star gets a moonlight like effect the sky above the moon would be dominated by a huge silvery orb making a dark night almost impossible until the planet came into eclipse with the moon.

In which case there would be a long period without sunlight and the only light coming from the station would be it's own lights.

This would be great if it was worked out from the beginning, it would make the Forest Moon a really interesting alien place but it would be a real task to work into the currently filmed footage.