Viewing behavior and vertical eye-level light for non-image-forming effects in an open-plan office

When considering non-image-forming (NIF) light effects on people, knowing the light vertically at eye-level is necessary. However, people are dynamic in their behavior and constantly change their viewing direction.  This means that light measured vertically towards a constant direction might differ from the actual light that reaches people’s eyes.  If the difference is large, viewing behavior might need to be included in lighting design measurements and simulations predicting the potential of the light to induce NIF light effects. This dataset was collected during an experiment on the difference between the actual dynamic eye-level light of office workers in an operating open-plan office (dynamic condition) and light measured statically towards a computer screen (static condition). The dataset was collected to answer the research question: "What is the difference between the actual amount of light incident at the eyes of office workers in an open-plan office and light measured for a static vertical direction towards a computer screen?". It includes measured light quantities (illuminance, alpha-opic quantities according to CIE S026), participants' measured face orientation (horizontal and vertical) together with several environmental (global horizontal irradiance, number of people present in the office) and personal factors (sleep quality, self-reported sleepiness, experience of visual and/or auditory distractions, mental demand of task).