Light is the medium that makes visual perception possible. The main source of light is the sun, it provides us with deferent tones of light during the day. We experience our environment first and foremost through our eyes. 80 percent of the sensory impressions we receive are visual. Too much or too little light, glare or distorted colors impact on what we perceive, distract our attention and cause visual fatigue. As our work world becomes increasingly service-oriented, more and more people work in office or workstation environments. In addition to the buildings we classify as office...