What are the main approaches to good lighting planning? When I began my career in lighting technology 5 decades ago, I was only interested in the technical and physical aspects.

In the mid-twentieth century, measuring lux and efficiency and calculating lighting systems was the »standard setting« for the entire profession. But what is the purpose of these specific values? Were we perhaps approaching the topic from the wrong angle?

To understand the fundamentals of light and its effects we must direct our attention to the mainspring of every project: the human eye. (Christian Bartenbach)