I love this building but I agree with SurrealPlaces, they should've had more glass ... from the interior renders it looks like a very natural-light-driven building, flooding with sunlight. I think that'd set a very nice peaceful atmosphere throughout the library. In fact, the renders seem to show way more windows than the actual thing has. That's a shame. Not sure if this is quite enough, I'd expect they'd still have to have electric lights on in the day time in some places. I just hope they do it right. Fluorescent bulbs everywhere isn't very attractive.
Are there any skylights anywhere? That'd ease my worry a lot.