The thing about having black bookcases is that they're, well, black. Stuff inside tends to disappear into an inky void and not show itself off well.
But the good news is that we have technology. In particular, cheap LED self-adhesive strips.
I'd say that's a nice improvement. There's one strip down each side, then a third strip up the middle behind the left-hand door. I still need to do the matching bookcase, though I might need a slightly longer power cord for it as the outlet is on the opposite side of the bookcase.