During the day, the large glass roof and windows let in plentiful light. But at the moment, with the sun having long-since set, the light was provided by several dozen gas lanterns around the room. Not that she needed the light. For her, the moonlight alone would have provided more than enough to read by. Even starlight would have been sufficient. However, she was expecting company, and it would be rude and nonsensical to make her guest stumble in the dark. 