Why don't ancient houses in China pay attention to lighting?

In ancient times, houses and mansions were not well lit.

First of all, windows are made of paper instead of glass. Some are made of glass, but they are all colored. Moreover, houses built by ancient people are warm in winter and cool in summer. For example, the palaces built in the Temple of Heaven and the Forbidden City are not very transparent, but the roofs are magnificent and the roofs inside are very high. Houses built in ancient times are a contemporary art, and it is very rare for ancient buildings to be preserved until now. I also have to admire the ancient craftsmen. The craftsman spirit that modern people have always wanted to learn is worth learning. Modern architecture is becoming more and more modern, which improves the speed and progress, but loses the traditional craftsmanship of ancient buildings.