Most of how we perceive things comes from our visual input.
Visual input is based entirely on light.
Thus, lighting becomes incredibly important in our understanding of the spaces we occupy. This is true of natural light, and of electric and other sources, as well. My original interest was the natural light in buildings, just as landscape was my first energy interest. More recently, I have recognized the positively theatrical effects that lighting has on and in a building. Finding the architect's concept and reinforcing has become my interest.